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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 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Basic net income per common share:            
Net income $ 13.5 $ 28.9 $ 50.0 $ 36.5 $ 42.4 $ 86.5
Weighted average common shares outstanding - Basic (in shares) 80.2   82.5   80.7 83.2
Basic net income per common share $ 0.17   $ 0.61   $ 0.53 $ 1.04
Diluted net income per common share:            
Net income $ 13.5   $ 50.0   $ 42.4 $ 86.5
Weighted average common shares outstanding - Basic (in shares) 80.2   82.5   80.7 83.2
Plus incremental shares from assumed conversions:            
Weighted average common shares outstanding - Dilutive (in shares) 80.6   83.2   81.1 84.0
Diluted net income per common share $ 0.17   $ 0.6   $ 0.52 $ 1.03
Restricted Stock Units            
Plus incremental shares from assumed conversions:            
Incremental shares from assumed conversions 0.3   0.4   0.3 0.4
Employee Stock Option            
Plus incremental shares from assumed conversions:            
Incremental shares from assumed conversions 0.1   0.3   0.2 0.4