Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions		Total	Common Stock		APIC		Retained Earnings	AOCI	[2]
Beginning Balance at Dec. 31, 2021		$ 1,812.4	$ 0.7		$ 1,148.6	[1]	$ 682.5	$ (19.4)
Balance (in shares) at Dec. 31, 2021			70.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase and retirement of common stock, net	[3]	$ (338.1)	$ (0.1)				(338.0)
Repurchase and retirement of common stock, net ( in shares)		(5.8)	(5.8)	[3]
Net change in equity forward contracts	[3]	$ (50.0)			(50.0)	[1]
Issuance of common stock, net of shares withheld for taxes		14.1	$ 0.1		14.0	[1]
Issuance of common stock, net of shares withheld for taxes ( in shares)			0.5
Stock-based compensation		21.0			21.0	[1]
Other comprehensive income (loss)		5.7						5.7
Net income (loss)		385.1					385.1
Dividends on Preferred Stock		(18.0)					(18.0)
Ending Balance at Sep. 30, 2022		1,832.2	$ 0.7		1,133.6	[1]	711.6	(13.7)
Balance (in shares) at Sep. 30, 2022			65.1
Beginning Balance at Jun. 30, 2022		$ 1,676.3	$ 0.6		1,123.5	[1]	562.8	(10.6)
Balance (in shares) at Jun. 30, 2022			65.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase and retirement of common stock, net ( in shares)		0.0
Issuance of common stock, net of shares withheld for taxes		$ 2.3	$ 0.1		2.2	[1]
Issuance of common stock, net of shares withheld for taxes ( in shares)			0.1
Stock-based compensation		7.9			7.9	[1]
Other comprehensive income (loss)		(3.1)						(3.1)
Net income (loss)		154.8					154.8
Dividends on Preferred Stock		(6.0)					(6.0)
Ending Balance at Sep. 30, 2022		1,832.2	$ 0.7		1,133.6	[1]	711.6	(13.7)
Balance (in shares) at Sep. 30, 2022			65.1
Beginning Balance at Dec. 31, 2022		1,904.1	$ 0.6		1,187.2	[1]	728.8	(12.5)
Balance (in shares) at Dec. 31, 2022			64.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase and retirement of common stock, net	[3]	$ (100.5)					(100.5)
Repurchase and retirement of common stock, net ( in shares)		(1.5)	(1.5)	[3]
Repurchase of Preferred Stock, net		$ 414.6					414.6
Issuance of common stock, net of shares withheld for taxes		6.6			6.6	[1]
Issuance of common stock, net of shares withheld for taxes ( in shares)			0.5
Stock-based compensation		22.2			22.2	[1]
Other comprehensive income (loss)		6.6						6.6
Proceeds from disgorgement of short-swing profits, net of tax		4.3			4.3
Net income (loss)		339.9					339.9
Dividends on Preferred Stock		(18.9)					(18.9)
Ending Balance at Sep. 30, 2023		1,749.7	$ 0.6		1,220.3	[1]	534.7	(5.9)
Balance (in shares) at Sep. 30, 2023			63.2
Beginning Balance at Jun. 30, 2023		2,022.7	$ 0.6		1,208.1	[1]	820.1	(6.1)
Balance (in shares) at Jun. 30, 2023			63.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase and retirement of common stock, net	[3]	$ (25.2)					(25.2)
Repurchase and retirement of common stock, net ( in shares)		(0.3)	(0.4)	[3]
Repurchase of Preferred Stock, net		$ 414.6					414.6
Issuance of common stock, net of shares withheld for taxes ( in shares)			0.2
Stock-based compensation		7.9			7.9	[1]
Other comprehensive income (loss)		0.2						0.2
Proceeds from disgorgement of short-swing profits, net of tax		4.3			4.3
Net income (loss)		161.3					161.3
Dividends on Preferred Stock		(6.9)					(6.9)
Ending Balance at Sep. 30, 2023		$ 1,749.7	$ 0.6		$ 1,220.3	[1]	$ 534.7	$ (5.9)
Balance (in shares) at Sep. 30, 2023			63.2

[1] Additional Paid-in Capital (“APIC”).

[2] Accumulated Other Comprehensive Income (Loss) (“AOCI”).

[3] See Note 7 for additional information.