Earnings Per Common Share - Summary 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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings per common share—basic
Net income	$ 117.4	$ 105.4	$ 142.4	$ 192.1
Weighted-average common shares outstanding—basic (in shares)	185.2	184.7	185.2	184.9
Earnings (loss) per common share (in dollars per share)	$ 0.63	$ 0.57	$ 0.77	$ 1.04
Earnings per common share—diluted
Net income	$ 117.4	$ 105.4	$ 142.4	$ 192.1
Interest expense	1.6	1.6	3.2	3.2
Net income attributable to earnings per common share—diluted	$ 119.0	$ 107.0	$ 145.6	$ 195.3
Weighted-average common shares outstanding—basic (in shares)	185.2	184.7	185.2	184.9
Convertible notes weighted-average shares outstanding (in shares)	14.7	14.7	14.7	14.7
Outstanding options, restricted stock units and performance share units (in shares)	1.4	1.2	1.5	1.1
Weighted-average common shares outstanding—diluted (in shares)	201.3	200.6	201.4	200.7
Earnings (loss) per common share—diluted (in dollars per share)	$ 0.59	$ 0.53	$ 0.72	$ 0.97