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Derivative Instruments and Hedging Activities - Amounts Included in OCI, Income and AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) reclassified from OCI into income (effective portion) $ (7.8) $ 5.7 $ (34.4) $ (0.4)
Commodity Contracts [Member] | Revenues [Member] | Not Designated as Hedging Instrument [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income on derivatives (2.2) (0.4) (13.0) (1.4)
Cash Flow Hedging [Member] | Commodity Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in OCI on derivatives (effective portion) $ (103.0) $ 29.8 $ (38.3) $ 96.0