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Derivative Instruments - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]                      
Gain (loss) recognized in earnings related to fair value or cash flow hedges excluded from assessment of hedge effectiveness                 $ 0 $ 0 $ 0
Revenues $ 4,702,100,000 $ 4,482,700,000 $ 3,158,300,000 $ 8,015,200,000 $ 9,358,100,000 $ 9,322,700,000 $ 9,459,400,000 $ 8,678,800,000 20,358,300,000 36,819,000,000.0 39,750,300,000
Cost of Revenue                 19,506,500,000 35,707,000,000.0 38,731,800,000
Collateral posted and held by our counterparties $ 0       $ 0       0 0  
Reclassification out of Accumulated Other Comprehensive Income                      
Derivative [Line Items]                      
Revenues                 505,600,000 (51,500,000) (34,400,000)
Cost of Revenue                 (181,600,000) (7,100,000) 21,300,000
Revenue                      
Derivative [Line Items]                      
Amount scheduled to be reclassified over the next twelve months                 108,900,000    
Revenues                 20,358,300,000 36,819,000,000.0 39,750,300,000
Cost of revenue                      
Derivative [Line Items]                      
Amount scheduled to be reclassified over the next twelve months                 106,400,000    
Cost of Revenue                 $ 19,506,500,000 $ 35,707,000,000.0 $ 38,731,800,000
Interest Rate Swap                      
Derivative [Line Items]                      
Derivative, notional amount       $ 300,000,000