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Net Income Per Common Share - Summary of Earnings Per Share Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Basic net income per common share:                
Net income $ 39.8 $ 50.0 $ 36.5 $ 38.7 $ 42.5 $ 42.7 $ 126.3 $ 123.9
Weighted average common shares outstanding - Basic (in shares) 81.5     84.6     82.6 84.6
Basic net income per common share $ 0.49     $ 0.46     $ 1.53 $ 1.46
Diluted net income per common share:                
Net income $ 39.8     $ 38.7     $ 126.3 $ 123.9
Weighted average common shares outstanding - Basic (in shares) 81.5     84.6     82.6 84.6
Plus incremental shares from assumed conversions:                
Weighted average common shares outstanding - Dilutive (in shares) 82.1     85.6     83.3 85.5
Diluted net income per common share $ 0.49     $ 0.45     $ 1.52 $ 1.45
Restricted Stock Units                
Plus incremental shares from assumed conversions:                
Incremental shares from assumed conversions 0.4     0.6     0.4 0.5
Employee Stock Option                
Plus incremental shares from assumed conversions:                
Incremental shares from assumed conversions 0.3     0.4     0.3 0.4