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Derivatives - Effect on Income (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Gain (loss) on derivative      
Carrying Amount of Hedged Asset/(Liabilities) $ 68,900,000 $ 55,500,000  
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Asset/(Liabilities) 2,600,000 (100,000)  
Revenue 9,181,300,000 8,194,300,000  
Cost of revenue 8,937,900,000 7,962,900,000  
Gains or Loss on fair value hedge relationships      
Gain (Loss) recognized in earnings related to fair value or cash flow hedges excluded from assessment of hedge effectiveness 0 0  
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income 5,100,000 7,100,000  
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income 14,600,000 (3,400,000)  
Potential Collateral Requirements for Derivative Liabilities with Credit-Risk-Contingent Features      
Net derivatives liability positions with credit contingent features 10,800,000   $ 11,800,000
Maximum potential collateral requirements 10,800,000   11,800,000
Collateral posted and held by our counterparties 0   $ 0
Revenue      
Gain (loss) on derivative      
Revenue 9,181,300,000 8,194,300,000  
Gains or Loss on fair value hedge relationships      
Hedged Item 0 0  
Derivatives designated as hedging instruments 0 0  
Revenue, Excluding Impact Of Hedges 9,184,900,000 8,184,200,000  
Cost of revenue      
Gain (loss) on derivative      
Cost of revenue 8,937,900,000 7,962,900,000  
Gains or Loss on fair value hedge relationships      
Hedged Item 5,500,000 (3,600,000)  
Derivatives designated as hedging instruments (5,600,000) 5,300,000  
Total amount of income of expense line items excluding the impact of hedges 8,956,000,000.0 7,971,400,000  
Commodity contracts | Revenue      
Gains or Loss on fair value hedge relationships      
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (2,300,000) 57,100,000  
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (3,600,000) (10,100,000)  
Commodity contracts | Cost of revenue      
Gains or Loss on fair value hedge relationships      
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income 10,200,000 (50,000,000.0)  
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income 18,200,000 6,800,000  
Foreign currency contracts | Other Expense [Member]      
Gains or Loss on fair value hedge relationships      
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (2,800,000) 0  
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income 0 0  
Derivatives not designated as hedging instruments      
Gains or Loss on fair value hedge relationships      
Amount of Realized and Unrealized Gain (Loss) 7,200,000 8,300,000  
Derivatives not designated as hedging instruments | Commodity contracts      
Gains or Loss on fair value hedge relationships      
Amount of Realized and Unrealized Gain (Loss) 10,600,000 10,400,000  
Derivatives not designated as hedging instruments | Commodity contracts | Revenue      
Gains or Loss on fair value hedge relationships      
Amount of Realized and Unrealized Gain (Loss) 47,600,000 49,200,000  
Derivatives not designated as hedging instruments | Commodity contracts | Cost of revenue      
Gains or Loss on fair value hedge relationships      
Amount of Realized and Unrealized Gain (Loss) (37,000,000.0) (38,800,000)  
Derivatives not designated as hedging instruments | Foreign currency contracts      
Gains or Loss on fair value hedge relationships      
Amount of Realized and Unrealized Gain (Loss) (3,400,000) (2,000,000.0)  
Derivatives not designated as hedging instruments | Foreign currency contracts | Revenue      
Gains or Loss on fair value hedge relationships      
Amount of Realized and Unrealized Gain (Loss) (600,000) (500,000)  
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Expense [Member]      
Gains or Loss on fair value hedge relationships      
Amount of Realized and Unrealized Gain (Loss) (2,800,000) (1,600,000)  
Accumulated gain (loss), cash flow hedge, including noncontrolling interest | Reclassification out of AOCI | Revenue      
Gain (loss) on derivative      
Revenue (3,600,000) (10,100,000)  
Accumulated gain (loss), cash flow hedge, including noncontrolling interest | Reclassification out of AOCI | Cost of revenue      
Gain (loss) on derivative      
Cost of revenue $ 18,200,000 $ 6,800,000