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Net Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Numerator:    
Net earnings $ 113.5 $ 82.0
Distributed and allocated undistributed net earnings to unvested restricted stockholders 0.0 0.0
Net earnings available to common stockholders $ 113.5 $ 82.0
Denominator:    
Weighted average number of common shares outstanding - basic (in shares) 146.2 144.9
Basic net earnings per common share:    
Basic net earnings per common share (in dollars per share) $ 0.78 $ 0.57
Numerator:    
Net earnings available to common stockholders $ 113.5 $ 82.0
Denominator:    
Weighted average number of common shares outstanding - basic (in shares) 146.2 144.9
Effect of dilutive stock shares and units (in shares) 0.6 0.5
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 146.8 145.4
Diluted net earnings per common share (in dollars per share) $ 0.77 $ 0.56