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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]              
Other Comprehensive Income, Available-For-Sale Securities, Net Unamortized (Gain) Loss Arising During Period, Net of Tax $ 0.0 $ 0.0 $ 0.0        
After-tax components of comprehensive income (loss)              
Foreign Currency Translation Adjustment, Beginning Balance (146.4) (111.5) (70.5)        
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0.0 0.0 0.0        
Reclassification from other comprehensive income to earnings 0.0 0.0 0.0        
Foreign currency translation adjustment (1.8) (34.9) (41.0)        
Foreign Currency Translation Adjustment, Ending Balance (148.2) (146.4) (111.5)        
Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Postretirement Plans And Workers Compensation Obligation Net Of Tax       $ (256.3) $ (263.8) $ (317.5) $ (205.8)
Other Comprehensive Income (Loss), Postretirement Plans and Workers' Compensation Obligations, Period Increase Decrease, Net of Tax 0.0 0.0 0.0        
Reclassification from other comprehensive income to earnings 21.0 35.6 31.0        
Current period change (13.5) 18.1 (142.7)        
Prior Service Cost Associated with Postretirement Plans, Beginning Balance 31.8 25.1 12.0        
Other Comprehensive Income (Loss), Prior Service Cost Associated with Postretirement Plans, Period Increase Decrease, Net of Tax 0.0 0.0 0.0        
Reclassification from other comprehensive income to earnings (5.6) (3.7) 1.7        
Current period change (4.5) 10.4 11.4        
Prior Service Cost Associated with Postretirement Plans, Ending Balance 21.7 31.8 25.1        
Cash Flow Hedges, Beginning Balance (240.5) (360.9) (155.7)        
Increase in fair value of cash flow hedges, net of tax 0.0 (131.3) (195.0)        
Reclassification for realized losses (gains) included in net loss 146.3 251.7 (10.2)        
Current Period Change 0.0 0.0 0.0        
Cash Flow Hedges, Ending Balance (94.2) (240.5) (360.9)        
Available-For-Sale Securities Adjustment, Beginning Balance 0.0 0.0 0.8        
Unrealized holding losses on available-for-sale securities 0.0 0.0 (3.7)        
Reclassification from other comprehensive income to earnings 0.0 0.0 (2.9)        
Available-For-Sale Securities Adjustment, Ending Balance 0.0 0.0 0.0        
Total Accumulated Other Comprehensive Income (Loss), Beginning Balance (477.0) (618.9) (764.8) $ (477.0) $ (618.9) $ (764.8) $ (419.2)
Accumulated Other Comprehensive Loss Net Change in Fair Value of Cash Flow Hedges and Available for Sale Securities 0.0 (131.3) (198.7)        
Total Accumulated Other Comprehensive Income (Loss), Reclassification 161.7 283.6 25.4        
Total Accumulated Other Comprehensive Income (Loss), Current period change net of tax (19.8) (6.4) (172.3)        
Total Accumulated Other Comprehensive Income (Loss), Ending Balance (477.0) (618.9) (764.8)        
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Cash flow hedges   (438.4) [1] $ (47.9) [2]        
Definedbenefitpensionplanspriorservicecost [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations 0.3 1.0          
IncomeTaxProvisionCashFlowHedges [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Cash flow hedges 85.9 134.0          
TotalBeforeIncomeTaxesCashFlowHedges [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Cash flow hedges 232.2 385.7          
InsignificantItemsCashFlowHedges [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Cash flow hedges 0.5 0.7          
CoalTradingOtherRevenues [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Cash flow hedges 0.0 (51.8)          
CommoditySwapsOperatingCostsAndExpenses [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Cash flow hedges 86.1 120.4          
ForeignCurrencyCashFlowHedgeContractsOperatingCostsAndExpenses [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Cash flow hedges 145.6 316.4          
Incometaxprovisionpriorservicecost [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations (3.3) (2.1)          
PriorServiceCostAssociatedWithPostretirementPlansAndWorkersCompensationObligationsTotalBeforeIncomeTaxes [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations (8.9) (5.8)          
PostretirementHealthCareAndLifeInsuranceBenefitsOperatingCostsAndExpensesPriorServiceCost [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations (9.2) (6.8)          
IncomeTaxProvisionActuarialLoss [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations (12.4) (20.9)          
NetActuarialLossAssociatedWithPostretirementPlansAndWorkersCompensationObligationsTotalBeforeIncomeTaxes [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations 33.4 56.5          
InsignificantItemsActuarialLoss [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations (11.7) (8.0)          
DefinedBenefitPensionPlansSellingAndAdministrativeExpensesActuarialLoss [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations 4.2 6.7          
DefinedBenefitPensionPlansOperatingCostsAndExpensesActuarialLoss [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations 20.5 32.9          
PostretirementHealthCareAndLifeInsuranceBenefitsOperatingCostsAndExpensesActuarialLoss [Member]              
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract]              
Net actuarial loss and prior service cost associated with postretirement plans and workers compensation obligations $ 20.4 $ 24.9          
[1] (1) Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $14.9 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012.
[2] Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $136.9 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012.