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Quarterly report pursuant to Section 13 or 15(d)

DISCONTINUED OPERATIONS Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis - North American Coal (Details)

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DISCONTINUED OPERATIONS Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis - North American Coal (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] Ìý Ìý
Assets, Fair Value Disclosure, Nonrecurring $ 397.2 $ 79.4
Impairment Charges 269.5 644.7
North American Coal [Member] Ìý Ìý
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] Ìý Ìý
Property, Plant, and Equipment, Fair Value Disclosure 20.4 Ìý
Tangible Asset Impairment Charges (73.4) Ìý
Assets, Fair Value Disclosure, Nonrecurring 20.4 Ìý
Impairment Charges (73.4) Ìý
Fair Value, Inputs, Level 1 [Member] Ìý Ìý
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] Ìý Ìý
Assets, Fair Value Disclosure, Nonrecurring 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | North American Coal [Member] Ìý Ìý
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] Ìý Ìý
Property, Plant, and Equipment, Fair Value Disclosure 0.0 Ìý
Assets, Fair Value Disclosure, Nonrecurring 0.0 Ìý
Fair Value, Inputs, Level 2 [Member] Ìý Ìý
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] Ìý Ìý
Assets, Fair Value Disclosure, Nonrecurring 397.2 0.0
Fair Value, Inputs, Level 2 [Member] | North American Coal [Member] Ìý Ìý
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] Ìý Ìý
Property, Plant, and Equipment, Fair Value Disclosure 0.0 Ìý
Assets, Fair Value Disclosure, Nonrecurring 0.0 Ìý
Fair Value, Inputs, Level 3 [Member] Ìý Ìý
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] Ìý Ìý
Assets, Fair Value Disclosure, Nonrecurring 0.0 $ 79.4
Fair Value, Inputs, Level 3 [Member] | North American Coal [Member] Ìý Ìý
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] Ìý Ìý
Property, Plant, and Equipment, Fair Value Disclosure 20.4 Ìý
Assets, Fair Value Disclosure, Nonrecurring $ 20.4 Ìý