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Debt and Credit Facilities (Narrative) (Details)
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3 Months Ended | 3 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2011
USD ($)
|
Jun. 30, 2011
USD ($)
|
Jun. 30, 2011
Senior Notes [Member]
Consolidated Thompson [Member]
USD ($)
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Jun. 30, 2011
Term Loan $1.25 Billion [Member]
Consolidated Thompson [Member]
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Sep. 30, 2010
Senior Notes $700 Million due 2021 [Member]
USD ($)
|
Jun. 30, 2011
Asia Pacific Iron Ore [Member]
Credit Facility Amendment [Member]
USD ($)
|
Jun. 30, 2011
Asia Pacific Iron Ore [Member]
Credit Facility Amendment [Member]
AUD
|
Mar. 31, 2010
Asia Pacific Iron Ore [Member]
Credit Facility Amendment [Member]
USD ($)
|
Mar. 31, 2010
Asia Pacific Iron Ore [Member]
Credit Facility Amendment [Member]
AUD
|
Jun. 30, 2011
Consolidated Thompson [Member]
USD ($)
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May 10, 2011
Consolidated Thompson [Member]
USD ($)
|
Jul. 31, 2011
Bloom Lake [Member]
USD ($)
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Mar. 31, 2011
Senior Notes 30-Year Tranche [Member]
USD ($)
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Mar. 31, 2011
Senior Notes 10-Year Tranche [Member]
USD ($)
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Jun. 30, 2011
Revolving Credit Facility [Member]
USD ($)
|
Dec. 31, 2010
Revolving Credit Facility [Member]
USD ($)
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| Senior notes | $ 125,000,000 | $ 500,000,000 | $ 300,000,000 | $ 700,000,000 | ||||||||||||
| Face Amount of Senior Long Term Notes | 1,000,000,000 | 100,000,000 | ||||||||||||||
| Stated interest rate | 8.50% | 6.25% | 4.875% | |||||||||||||
| Discount interest rate on redemption | 40 | 25 | ||||||||||||||
| Premium on principal required to redeem notes | 101.00% | |||||||||||||||
| Redemption price, percent of principal in the event of change of control | 100.00% | |||||||||||||||
| Credit facility | 42,900,000 | 40,000,000 | 750,000,000 | |||||||||||||
| Customer borrowings | 1,250,000,000 | |||||||||||||||
| Weighted average interest rate | 2.05% | 2.56% | ||||||||||||||
| Outstanding bank guarantees under credit facilities | 26,100,000 | 24,300,000 | 66,600,000 | 64,700,000 | ||||||||||||
| Credit facility remaining capacity | 16,800,000 | 15,700,000 | 533,400,000 | 535,300,000 | ||||||||||||
| Letters of Credit Outstanding, Amount | 48,700,000 | 14,300,000 | ||||||||||||||
| Maturities of debt instruments in 2011 | 31,000,000 | |||||||||||||||
| Maturities of debt instruments in 2012 | 94,000,000 | |||||||||||||||
| Maturities of debt instruments in 2013 | 395,000,000 | |||||||||||||||
| Maturities of debt instruments in 2014 | 156,000,000 | |||||||||||||||
| Maturities of debt instruments in 2015 | 524,000,000 | |||||||||||||||
| Maturities of debt instruments in 2016 | 375,000,000 | |||||||||||||||
| Maturities of debt instruments after 2016 | $ 2,400,000,000 | |||||||||||||||