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Net Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Numerator:        
Net earnings $ 98.3 $ 99.1 $ 180.3 $ 161.0
Distributed and allocated undistributed net earnings to unvested restricted stockholders 0.0 0.0 0.0 0.0
Net earnings available to common stockholders $ 98.3 $ 99.1 $ 180.3 $ 161.0
Denominator:        
Weighted average number of common shares outstanding - basic (in shares) 145.7 144.5 145.3 144.3
Basic net earnings per common share:        
Basic net earnings per common share (in dollars per share) $ 0.67 $ 0.69 $ 1.24 $ 1.12
Numerator:        
Net earnings available to common stockholders $ 98.3 $ 99.1 $ 180.3 $ 161.0
Denominator:        
Weighted average number of common shares outstanding - basic (in shares) 145.7 144.5 145.3 144.3
Effect of unvested restricted stock units (in shares) 0.3 0.3 0.4 0.5
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 146.0 144.8 145.7 144.8
Diluted net earnings per common share (in dollars per share) $ 0.67 $ 0.68 $ 1.24 $ 1.11