Earnings Per Share - Computation of Basic and Diluted Income Per Common 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	$ 805.1	$ 765.2	$ 1,029.8
Less: Distributed and undistributed earnings allocated to participating securities	(5.6)	(6.2)	(7.9)
Net income attributable to common stockholders	$ 799.5	$ 759.0	$ 1,021.9
Denominator:
Weighted average common shares outstanding (in shares)	89.1	89.1	92.3
Effect of dilutive securities (in shares)	0.4	0.4	0.4
Diluted common shares outstanding (in shares)	89.5	89.5	92.7
Basic income per common share (in dollars per share)	$ 8.97	$ 8.52	$ 11.08
Diluted income per common share (in dollars per share)	$ 8.93	$ 8.48	$ 11.03