Net Income (Loss) Per Common Share - Components and Calculation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net income (loss)	$ 361.7	$ 435.0	$ 458.4
Dividends on Preferred Stock	0.0	(13.9)	(24.0)
Undistributed income allocated to participating securities	0.0	(34.1)	(54.8)
Repurchase Premium	0.0	(414.6)	0.0
Net income (loss) attributable to common stockholders - Basic	361.7	(27.6)	379.6
Net income (loss) attributable to common stockholders - Diluted	$ 361.7	$ (27.6)	$ 379.6
Denominator:
Weighted-average common shares outstanding - Basic (in shares)	62.5	63.7	67.1
Effect of common share equivalents (in shares)	1.2	0.0	1.3
Weighted-average common shares outstanding - Diluted (in shares)	63.7	63.7	68.4
Net income (loss) per common share:
Basic (in dollars per share)	$ 5.78	$ (0.43)	$ 5.66
Diluted (in dollars per share)	$ 5.68	$ (0.43)	$ 5.55