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Significant Accounting Policies - Derivative Accounting (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 01, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Notional derivative contracts		$ 8,600,000
Net positive exposure		43,000	$ 52,000
Increase to retained earnings		2,562,835	3,311,836
Gains (losses) on derivatives and hedging activities, net		49,544	17,825	$ (87)
Retained Earnings
Derivative Instruments, Gain (Loss) [Line Items]
Increase to retained earnings		1,722,365	1,850,512	1,340,017	$ 868,182
Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Increase to retained earnings		(34,200)	(12,367)	$ 10,623	$ 2,748
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Derivative Instruments, Gain (Loss) [Line Items]
Increase to retained earnings			$ (952,639)
Cumulative Effect, Period of Adoption, Adjustment | Fair Value
Derivative Instruments, Gain (Loss) [Line Items]
Net positive exposure	$ 2,000
Cumulative Effect, Period of Adoption, Adjustment | Fair Value | Retained Earnings
Derivative Instruments, Gain (Loss) [Line Items]
Increase to retained earnings	800
Cumulative Effect, Period of Adoption, Adjustment | Fair Value | Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives and hedging activities, net	3,000
Cumulative Effect, Period of Adoption, Adjustment | Cash Flow | Retained Earnings
Derivative Instruments, Gain (Loss) [Line Items]
Increase to retained earnings	200
Cumulative Effect, Period of Adoption, Adjustment | Cash Flow | Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Increase to retained earnings	$ 300
CME
Derivative Instruments, Gain (Loss) [Line Items]
Notional derivative contracts		$ 8,200,000
Percent of total notional derivative contracts		95.30%
Amount of variation margin included as settlement		$ (179,000)
LCH
Derivative Instruments, Gain (Loss) [Line Items]
Notional derivative contracts		$ 400,000
Percent of total notional derivative contracts		4.70%
Amount of variation margin included as settlement		$ 19,000

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