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Net Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Numerator:        
Net earnings $ 91.7 $ 56.6 $ 272.0 $ 217.6
Distributed and allocated undistributed net earnings to unvested restricted stockholders 0.0 0.0 0.0 0.0
Net earnings available to common stockholders $ 91.7 $ 56.6 $ 272.0 $ 217.6
Denominator:        
Weighted average number of common shares outstanding - basic (in shares) 145.8 144.5 145.5 144.3
Basic net earnings per common share:        
Basic net earnings per common share (in dollars per share) $ 0.63 $ 0.39 $ 1.87 $ 1.51
Numerator:        
Net earnings available to common stockholders $ 91.7 $ 56.6 $ 272.0 $ 217.6
Denominator:        
Weighted average number of common shares outstanding - basic (in shares) 145.8 144.5 145.5 144.3
Effect of unvested restricted stock units (in shares) 0.3 0.4 0.3 0.5
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 146.1 144.9 145.8 144.8
Diluted net earnings per common share (in dollars per share) $ 0.63 $ 0.39 $ 1.87 $ 1.50