Earnings Per Common Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Earnings per common share—basic
Net income	$ 20.3	$ 2.1	$ 62.1	$ 6.5	$ 22.4	$ 68.6
Weighted-average common shares outstanding—basic (in shares)	183.8		183.5		183.6	183.6
Earnings per common share—basic (in dollars per share)	$ 0.11		$ 0.34		$ 0.12	$ 0.37
Earnings per common share—diluted
Net income	$ 20.3	$ 2.1	$ 62.1	$ 6.5	$ 22.4	$ 68.6
Interest expense attributable to convertible notes, net of tax	0.0		1.7		0.0	3.3
Net income attributable to earnings per common share—diluted	$ 20.3		$ 63.8		$ 22.4	$ 71.9
Weighted-average common shares outstanding—basic (in shares)	183.8		183.5		183.6	183.6
Incremental shares for assumed conversion of Convertible Notes (in shares)	0.0		14.7		0.0	14.7
Outstanding options, restricted stock units and performance share units (in shares)	1.3		1.4		0.7	1.1
Weighted-average common shares outstanding—diluted (in shares)	185.1		199.6		184.3	199.4
Earnings per common share—diluted (in dollars per share)	$ 0.11		$ 0.32		$ 0.12	$ 0.36