Derivatives - Interest Rate Swaps (Details) - USD ($)		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Apr. 30, 2019
Derivatives
Derivative, notional amount					$ 850,000,000.0
Derivative, fixed interest rate					2.28%
Loss on designated cash flow hedge	[1]	$ (13,100,000)	$ 0
Income tax expense (benefit)	[1]	(4,000,000.0)
Gain on interest rate swaps		(1,300,000)
Interest income (expense) expected to be reclassified out of accumulated other comprehensive income (loss) over the next twelve months		(16,300,000)
Fair value of derivative liabilities—current		(77,900,000)		$ (14,400,000)
Fair value of derivative liabilities—long-term		(13,400,000)		(6,800,000)
Interest rate swaps
Derivatives
Fair value of derivative liabilities—current		(16,100,000)		(5,600,000)
Fair value of derivative liabilities—long-term		(13,400,000)		(6,800,000)
Net fair value of commodity swaps		$ (29,500,000)		$ (12,400,000)

[1] Includes a tax benefit of $4.0 million for the three months ended March 31, 2020.