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Derivative Instruments and Hedging Activities - Amounts Included in OCI, Income and AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) reclassified from OCI into income (effective portion) $ (23.9) $ (2.1) $ (58.3) $ (2.2)
Commodity Contracts [Member] | Revenues [Member] | Not Designated as Hedging Instrument [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in income on derivatives (1.1) (1.5) (14.1) (2.9)
Cash Flow Hedging [Member] | Commodity Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in OCI on derivatives (effective portion) $ (139.6) $ (106.8) $ (178.0) $ (10.5)