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Derivatives and Fair Value Measurements (Details 1) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Gain (Loss) on Derivatives and Commodity Contracts $ 0.0 $ 25.0
Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (27.6) (111.0)
Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
loss reclassified from Accumulated OCI into income (27.6) (78.7)
(Loss) gain recognized in income on derivatives 0.0 (32.3)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts 0.0 25.0
Commodity swap contracts [Member] | Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Loss recognized in income on non-designated derivatives (11.0) (34.9)
Commodity swap contracts [Member] | Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
loss reclassified from Accumulated OCI into income (11.0) (24.8)
(Loss) gain recognized in income on derivatives 0.0 (10.1)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts 0.0 (5.4)
Foreign currency forward contract [Member] | Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Loss recognized in income on non-designated derivatives (16.6) (76.1)
Foreign currency forward contract [Member] | Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
loss reclassified from Accumulated OCI into income (16.6) (53.9)
(Loss) gain recognized in income on derivatives 0.0 (22.2)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts $ 0.0 $ 30.4