|
FAIR VALUE OF FINANCIAL INSTRUMENTS FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value Measurements, Nonrecurring) (Details) (USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
9 Months Ended |
12 Months Ended |
|
Sep. 30, 2014
|
Sep. 30, 2014
|
Dec. 31, 2013
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Goodwill, Impairment Loss |
|
$ 73.5
|
$ 80.9
|
| Tangible Asset Impairment Charges |
7,674.3
|
7,699.6
|
|
| Assets, Fair Value Disclosure, Nonrecurring |
1,457.2
|
1,457.2
|
47.9
|
| Impairment of goodwill and other long-lived assets |
|
7,782.3
|
318.4
|
|
Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Assets, Fair Value Disclosure, Nonrecurring |
0
|
0
|
0
|
|
Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Assets, Fair Value Disclosure, Nonrecurring |
0
|
0
|
0
|
|
Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Assets, Fair Value Disclosure, Nonrecurring |
1,457.2
|
1,457.2
|
47.9
|
|
Amapa [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Equity Method Investments, Fair Value Disclosure |
|
|
0
|
| Equity Method Investment, Other than Temporary Impairment |
|
|
67.6
|
|
Amapa [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Equity Method Investments, Fair Value Disclosure |
|
|
0
|
|
Amapa [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Equity Method Investments, Fair Value Disclosure |
|
|
0
|
|
Amapa [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Equity Method Investments, Fair Value Disclosure |
|
|
0
|
|
Global Exploration Investment in Venture [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Equity Method Investments, Fair Value Disclosure |
0
|
0
|
|
| Equity Method Investment, Other than Temporary Impairment |
|
9.2
|
|
|
Global Exploration Investment in Venture [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Equity Method Investments, Fair Value Disclosure |
0
|
0
|
|
|
Global Exploration Investment in Venture [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Equity Method Investments, Fair Value Disclosure |
0
|
0
|
|
|
Global Exploration Investment in Venture [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Equity Method Investments, Fair Value Disclosure |
0
|
0
|
|
|
Asia Pacific Iron Ore [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Goodwill, Fair Value Disclosure |
0
|
0
|
|
| Goodwill, Impairment Loss |
|
73.5
|
|
|
Asia Pacific Iron Ore [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Goodwill, Fair Value Disclosure |
0
|
0
|
|
|
Asia Pacific Iron Ore [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Goodwill, Fair Value Disclosure |
0
|
0
|
|
|
Asia Pacific Iron Ore [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Goodwill, Fair Value Disclosure |
0
|
0
|
|
|
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Goodwill, Fair Value Disclosure |
|
|
0
|
| Goodwill, Impairment Loss |
|
|
80.9
|
|
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Goodwill, Fair Value Disclosure |
|
|
0
|
|
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Goodwill, Fair Value Disclosure |
|
|
0
|
|
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Goodwill, Fair Value Disclosure |
|
|
0
|
|
Ferroalloys [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
12.2
|
12.2
|
|
| Tangible Asset Impairment Charges |
|
259.5
|
|
|
Ferroalloys [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
Ferroalloys [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
Ferroalloys [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
12.2
|
12.2
|
|
|
Other Reporting Units [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
| Tangible Asset Impairment Charges |
|
3.1
|
|
|
Other Reporting Units [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
Other Reporting Units [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
Other Reporting Units [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
Wabush and Cliffs Chromite Ontario and Cliffs Chromite Far North [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
|
|
46.3
|
| Tangible Asset Impairment Charges |
|
|
155.4
|
|
Wabush and Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
|
|
0
|
|
Wabush and Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
|
|
0
|
|
Wabush and Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
|
|
46.3
|
|
Wabush [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Other Asset Impairment Charges |
|
|
14.5
|
| Finite-lived Intangible Assets, Fair Value Disclosure |
|
|
1.6
|
|
Wabush [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Finite-lived Intangible Assets, Fair Value Disclosure |
|
|
0
|
|
Wabush [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Finite-lived Intangible Assets, Fair Value Disclosure |
|
|
0
|
|
Wabush [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Finite-lived Intangible Assets, Fair Value Disclosure |
|
|
1.6
|
|
Oak Grove [Member] | North American Coal [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
58.2
|
58.2
|
|
| Tangible Asset Impairment Charges |
|
237.8
|
|
|
Oak Grove [Member] | North American Coal [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
Oak Grove [Member] | North American Coal [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
Oak Grove [Member] | North American Coal [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
58.2
|
58.2
|
|
|
CLCC [Member] | North American Coal [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
62.6
|
62.6
|
|
| Tangible Asset Impairment Charges |
|
195.5
|
|
|
CLCC [Member] | North American Coal [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
CLCC [Member] | North American Coal [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
CLCC [Member] | North American Coal [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
62.6
|
62.6
|
|
|
Bloom Lake [Member] | Eastern Canadian Iron Ore [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
937.2
|
937.2
|
|
| Tangible Asset Impairment Charges |
|
6,279.2
|
|
|
Bloom Lake [Member] | Eastern Canadian Iron Ore [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
Bloom Lake [Member] | Eastern Canadian Iron Ore [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
Bloom Lake [Member] | Eastern Canadian Iron Ore [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
937.2
|
937.2
|
|
|
Asia Pacific [Member] | Asia Pacific Iron Ore [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
| Finite-lived Intangible Assets, Fair Value Disclosure |
0
|
0
|
|
|
Asia Pacific Iron Ore [Member] | Asia Pacific Iron Ore [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
343.4
|
343.4
|
|
| Tangible Asset Impairment Charges |
|
291.9
|
|
| Other Asset Impairment Charges |
|
10.1
|
|
| Finite-lived Intangible Assets, Fair Value Disclosure |
11.9
|
11.9
|
|
|
Asia Pacific Iron Ore [Member] | Asia Pacific Iron Ore [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
| Finite-lived Intangible Assets, Fair Value Disclosure |
0
|
0
|
|
|
Asia Pacific Iron Ore [Member] | Asia Pacific Iron Ore [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
343.4
|
343.4
|
|
| Finite-lived Intangible Assets, Fair Value Disclosure |
11.9
|
11.9
|
|
|
Wabush [Member] | Eastern Canadian Iron Ore [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
1.0
|
1.0
|
|
| Tangible Asset Impairment Charges |
|
12.8
|
|
| Other Asset Impairment Charges |
|
15.2
|
|
| Finite-lived Intangible Assets, Fair Value Disclosure |
0
|
0
|
|
|
Wabush [Member] | Eastern Canadian Iron Ore [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
| Finite-lived Intangible Assets, Fair Value Disclosure |
0
|
0
|
|
|
Wabush [Member] | Eastern Canadian Iron Ore [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
| Finite-lived Intangible Assets, Fair Value Disclosure |
0
|
0
|
|
|
Wabush [Member] | Eastern Canadian Iron Ore [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
1.0
|
1.0
|
|
| Finite-lived Intangible Assets, Fair Value Disclosure |
0
|
0
|
|
|
Pinnacle [Member] | North American Coal [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
30.7
|
30.7
|
|
| Tangible Asset Impairment Charges |
|
394.5
|
|
|
Pinnacle [Member] | North American Coal [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
Pinnacle [Member] | North American Coal [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
0
|
0
|
|
|
Pinnacle [Member] | North American Coal [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Property, Plant, and Equipment, Fair Value Disclosure |
$ 30.7
|
$ 30.7
|
|