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Acquisitions And Other Investments (Narrative) (Details)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2011
USD ($)
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Sep. 30, 2011
USD ($)
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Jun. 30, 2011
USD ($)
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Mar. 31, 2011
USD ($)
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Dec. 31, 2010
USD ($)
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Sep. 30, 2010
USD ($)
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Jun. 30, 2010
USD ($)
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Mar. 31, 2010
USD ($)
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Dec. 31, 2011
USD ($)
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Dec. 31, 2010
USD ($)
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Dec. 31, 2009
USD ($)
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Feb. 01, 2010
Wabush [Member]
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Jun. 30, 2011
Consolidated Thompson [Member]
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Dec. 31, 2011
Consolidated Thompson [Member]
USD ($)
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Dec. 31, 2009
Consolidated Thompson [Member]
USD ($)
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May 12, 2011
Consolidated Thompson [Member]
CAD
|
Dec. 31, 2011
WISCO [Member]
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Dec. 31, 2011
Wabush [Member]
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Dec. 31, 2010
Wabush [Member]
T
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Feb. 28, 2010
Wabush [Member]
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Dec. 31, 2010
Freewest [Member]
USD ($)
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Dec. 31, 2010
Freewest [Member]
CAD
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Mar. 31, 2010
Freewest [Member]
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Dec. 31, 2009
Freewest [Member]
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Dec. 31, 2011
Freewest [Member]
Ferrochrome [Member]
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Dec. 31, 2011
Freewest [Member]
Chromite Concentrate [Member]
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Dec. 31, 2010
Spider [Member]
CAD
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Jul. 26, 2010
Spider [Member]
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Jul. 06, 2010
Spider [Member]
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Jun. 30, 2010
Spider [Member]
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Dec. 31, 2011
Spider [Member]
Big Daddy's Chromite Deposit [Member]
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Dec. 31, 2011
CLCC [Member]
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Dec. 31, 2010
CLCC [Member]
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Dec. 31, 2010
CLCC [Member]
Metallurgical Coal [Member]
T
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Dec. 31, 2010
CLCC [Member]
Thermal Coal [Member]
T
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Dec. 31, 2011
Scenario, Previously Reported [Member]
Consolidated Thompson [Member]
USD ($)
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Dec. 31, 2010
Scenario, Previously Reported [Member]
Wabush [Member]
USD ($)
|
Dec. 31, 2010
Scenario, Previously Reported [Member]
Freewest [Member]
USD ($)
|
Dec. 31, 2010
Scenario, Previously Reported [Member]
Spider [Member]
USD ($)
|
Dec. 31, 2011
Scenario, Previously Reported [Member]
CLCC [Member]
USD ($)
|
Dec. 31, 2010
Scenario, Adjustment [Member]
Wabush [Member]
USD ($)
|
Dec. 31, 2011
Scenario, Adjustment [Member]
Consolidated Thompson [Member]
USD ($)
|
Dec. 31, 2010
Scenario, Adjustment [Member]
Wabush [Member]
USD ($)
|
Feb. 01, 2010
Scenario, Adjustment [Member]
Wabush [Member]
USD ($)
|
Dec. 31, 2010
Scenario, Adjustment [Member]
Freewest [Member]
USD ($)
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Dec. 31, 2010
Scenario, Adjustment [Member]
Spider [Member]
USD ($)
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Jul. 06, 2010
Scenario, Adjustment [Member]
Spider [Member]
USD ($)
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Dec. 31, 2011
Scenario, Adjustment [Member]
CLCC [Member]
USD ($)
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Jul. 30, 2010
Scenario, Adjustment [Member]
CLCC [Member]
USD ($)
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Dec. 31, 2010
Contractual Rights [Member]
Wabush [Member]
USD ($)
|
Dec. 31, 2011
Construction Permits [Member]
CLCC [Member]
USD ($)
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Dec. 31, 2011
Lease Agreements [Member]
CLCC [Member]
USD ($)
|
Dec. 31, 2010
Permits [Member]
Wabush [Member]
USD ($)
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Dec. 31, 2010
Lower Limit [Member]
Wabush [Member]
T
|
Dec. 31, 2010
Lower Limit [Member]
CLCC [Member]
Metallurgical Coal [Member]
T
|
Dec. 31, 2010
Upper Limit [Member]
Wabush [Member]
T
|
Dec. 31, 2010
Upper Limit [Member]
CLCC [Member]
Thermal Coal [Member]
T
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| Business Acquisition [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Percent ownership interest | 100.00% | 73.20% | 100.00% | 100.00% | 4.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Noncontrolling Interest, Ownership Percentage by Parent | 85.00% | 52.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Aggregate acquisition consideration | $ 4,600.0 | $ 4,554.0 | $ 103.0 | $ 185.9 | $ 56.9 | $ 774.5 | $ 4,554.0 | $ 103.0 | $ 103.0 | $ 185.9 | $ 56.9 | $ 775.9 | |||||||||||||||||||||||||||||||||||||||||||||
| Cash portion of acquisition consideration | 4,554.0 | 88.0 | 12.8 | 56.9 | 757.0 | 4,554.0 | 88.0 | 88.0 | 12.8 | 56.9 | 56.9 | 757.0 | 757.0 | ||||||||||||||||||||||||||||||||||||||||||||
| Working capital adjustment as part of acquisition consideration | 15.0 | 17.5 | 15.0 | 15.0 | 18.9 | 18.9 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Production capacity and reserve effects and rationale for acquisition |
CLCC is a producer of high-volatile metallurgical and thermal coal located in southern West Virginia. CLCC's operations include two underground continuous mining method metallurgical coal mines and one open surface thermal coal mine. The acquisition includes a metallurgical and thermal coal mining complex with a coal preparation and processing facility as well as a large, long-life reserve base with an estimated 59 million tons of metallurgical coal and 62 million tons of thermal coal. This reserve base increases our total global reserve base to over 166 million tons of metallurgical coal and over 67 million tons of thermal coal. This acquisition represented an opportunity for us to add complementary high-quality coal products and provided certain advantages, including among other things, long-life mine assets, operational flexibility and new equipment. |
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| Ownership interest before acquisition | 26.80% | 12.40% | 26.50% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ownership in equity method investment, Cliffs' percentage | 26.80% | 12.40% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair value of equity interest before acquisition | 39.7 | 27.4 | 4.9 | 38.0 | 27.4 | 4.9 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Gain on remeasurement of equity interest before acquisition | 38.6 | 40.7 | 13.6 | 47.0 | 25.0 | 25.1 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Gain on remeasurement of equity interest before acquisition recorded in Accumulated other comprehensive income (loss) | 20.3 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Acquired intangible assets | 2.1 | 66.4 | 7.5 | 2.1 | 66.4 | 7.5 | 54.7 | 5.4 | 2.1 | 11.7 | |||||||||||||||||||||||||||||||||||||||||||||||
| Goodwill | 983.5 | 1,026.8 | 15.4 | 77.1 | 24.7 | 983.5 | 3.1 | 5.7 | 75.2 | 27.8 | |||||||||||||||||||||||||||||||||||||||||||||||
| Goodwill tax deductibility | None of the goodwill is expected to be deductible for income tax purposes. | None of the preliminary goodwill is expected to be deductible for income tax purposes. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Number of shares acquired through business combination | 29.0 | 29.0 | 29.0 | 290.5 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Easement agreement fee, amortization period, years | 30 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Percentage of shares acquired | 12.40% | 48.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cost per share acquired | 17.25 | 1.00 | 0.19 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Common stock exchanged per share acquired | 0.0201 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair value of equity portion of acquisition consideration | 173.1 | 173.1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Number of shares issued as acquisition consideration | 4.2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Number of shares owned | 27.4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Acquisition price, value of iron ore pellets | 15.0 | 17.5 | 15.0 | 15.0 | 18.9 | 18.9 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Total consideration transferred including interest held prior to acquisition | 1.7 | 1.7 | 4,554.0 | 142.7 | 213.3 | 61.8 | 774.5 | 4,554.0 | 141.0 | 213.3 | 61.8 | 775.9 | 775.9 | ||||||||||||||||||||||||||||||||||||||||||||
| Subsidiary Or Equity Method Investee Percentage Ownership Acquired | 25.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Tons of rated capacity | 5,500,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Increase in tons of rated capacity | 4,000,000 | 50,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Estimated coal reserve base | 59,000,000 | 62,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Increase in coal reserve base | 166,000,000 | 67,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Initial production rate, metric tons | 16,000,000 | 8,000,000 | 600,000,000 | 1,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Incremental Revenue | 1,662.5 | 2,142.8 | 1,805.8 | 1,183.2 | 1,424.1 | 1,346.0 | 1,184.3 | 727.7 | 6,794.3 | 4,682.1 | 2,342.0 | 571.0 | |||||||||||||||||||||||||||||||||||||||||||||
| TOTAL REVENUES | 1,662.5 | 2,142.8 | 1,805.8 | 1,183.2 | 1,424.1 | 1,346.0 | 1,184.3 | 727.7 | 6,794.3 | 4,682.1 | 2,342.0 | 571.0 | |||||||||||||||||||||||||||||||||||||||||||||
| Acquisition related costs | 25.4 | 69.6 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Non-recurring inventory purchase accounting adjustments | 59.8 | 59.8 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Income from Continuing Operations | 2,348.6 | 1,270.2 | 236.1 | 143.7 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest expense | 216.5 | 70.1 | 39.0 | 38.3 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Deferred debt issuance costs recognized | 54.8 | 15.7 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accumulated amortization of deferred debt issuance costs | 1.9 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Portion of debt issuance costs net of accumulated amortization recorded in other current assets and other non-current assets | 1.7 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stepped-up value of inventory and reserves due to purchase accounting | 59.8 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Preliminary goodwill | 983.5 | 1,026.8 | 15.4 | 77.1 | 24.7 | 983.5 | 3.1 | 5.7 | 75.2 | 27.8 | |||||||||||||||||||||||||||||||||||||||||||||||
| Noncontrolling interest in subsidiary | 1,075.4 | 1,075.4 | 947.6 | 51.9 | 1,075.4 | 51.9 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Mineral rights | 7,918.9 | 3,019.9 | 7,918.9 | 3,019.9 | 4,825.6 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Long-term deferred tax liabilities | (1,041.8) | (1,041.8) | (831.5) | 20.5 | (57.4) | (2.7) | (16.5) | (1,041.8) | (54.3) | (5.1) | (15.9) | ||||||||||||||||||||||||||||||||||||||||||||||
| Deferred taxes | $ 1,041.8 | $ 1,041.8 | $ 831.5 | $ (20.5) | $ 57.4 | $ 2.7 | $ 16.5 | $ 1,041.8 | $ 54.3 | $ 5.1 | $ 15.9 | ||||||||||||||||||||||||||||||||||||||||||||||