Annual report pursuant to Section 13 and 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) - North American Coal [Member]
$ in Millions
 3 Months Ended
Mar. 31, 2016
USD ($)
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items]  
Property, Plant, and Equipment, Fair Value Disclosure $ 20.4
Tangible Asset Impairment Charges 73.4
Assets, Fair Value Disclosure, Nonrecurring 20.4
Impairment Charges 73.4
Fair Value, Inputs, Level 1 [Member]  
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items]  
Property, Plant, and Equipment, Fair Value Disclosure 0.0
Assets, Fair Value Disclosure, Nonrecurring 0.0
Fair Value, Inputs, Level 2 [Member]  
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items]  
Property, Plant, and Equipment, Fair Value Disclosure 0.0
Assets, Fair Value Disclosure, Nonrecurring 0.0
Fair Value, Inputs, Level 3 [Member]  
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items]  
Property, Plant, and Equipment, Fair Value Disclosure 20.4
Assets, Fair Value Disclosure, Nonrecurring $ 20.4