Derivatives - Interest Rate Swaps (Details) - USD ($)	1 Months Ended		3 Months Ended								6 Months Ended
	May 31, 2021	Dec. 31, 2020	Jun. 30, 2021		Mar. 31, 2021		Jun. 30, 2020		Mar. 31, 2020		Jun. 30, 2021		Jun. 30, 2020		Apr. 30, 2019
Derivatives
Derivative, notional amount			$ 250,000,000.0								$ 250,000,000.0				$ 850,000,000.0
Derivative, fixed interest rate															2.28%
Derivative, termination payment	$ 1,300,000	$ 10,900,000
Derivative, notional amount, amount terminated	100,000,000.0	500,000,000.0													$ 600,000,000.0
Derivative liability	$ 1,300,000	10,900,000	12,200,000								12,200,000
Change in fair value of derivatives due to accelerated amortization			3,100,000								6,000,000.0
Change in fair value of interest rate swaps			(23,800,000)				$ (18,800,000)				(31,700,000)		$ (5,800,000)
Tax benefit (expense)			(1,100,000)	[1]	$ (1,100,000)		(500,000)		$ 4,000,000.0		(2,200,000)		3,500,000
Unrealized gain (loss) on designated cash flow hedge			3,700,000	[1],[2]	$ 3,600,000	[3]	1,500,000	[1],[4]	$ (13,100,000)	[5]	7,300,000	[1]	(11,600,000)	[1]
Interest expense			4,800,000				3,700,000				9,600,000		5,000,000.0
Interest expense expected to be reclassified out of accumulated other comprehensive income (loss) over the next twelve months			8,700,000								8,700,000
Fair value of derivative liabilities—current		(37,100,000)	(107,600,000)								(107,600,000)
Interest rate swaps
Derivatives
Change in fair value of interest rate swaps			4,800,000				2,000,000.0				9,500,000		(15,100,000)
Tax benefit (expense)			(1,100,000)				(500,000)				(2,200,000)		3,500,000
Unrealized gain (loss) on designated cash flow hedge			3,700,000				$ 1,500,000				7,300,000		$ (11,600,000)
Fair value of derivative liabilities—current		$ (7,600,000)	$ (2,700,000)								$ (2,700,000)

[1] Includes a tax expense of $1.1 million and a tax expense of $0.5 million for the three months ended June 30, 2021 and 2020, respectively, and a tax expense of $2.2 million and a tax benefit of $3.5 million for the six months ended June 30, 2021 and 2020, respectively.

[2] Includes a tax expense of $1.1 million.

[3] Includes a tax expense of $1.1 million.

[4] Includes a tax expense of $0.5 million.

[5] Includes a tax benefit of $4.0 million.