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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator:        
Net earnings $ 255.1 $ 91.7 $ 461.7 $ 272.0
Distributed and allocated undistributed net earnings to unvested restricted stockholders 0.0 0.0 0.0 0.0
Net earnings available to common stockholders $ 255.1 $ 91.7 $ 461.7 $ 272.0
Denominator:        
Weighted average number of common shares outstanding - basic (in shares) 147.2 145.8 146.9 145.5
Basic net earnings per common share:        
Basic net earnings per common share (in dollars per share) $ 1.73 $ 0.63 $ 3.14 $ 1.87
Numerator:        
Net earnings available to common stockholders $ 255.1 $ 91.7 $ 461.7 $ 272.0
Denominator:        
Weighted average number of common shares outstanding - basic (in shares) 147.2 145.8 146.9 145.5
Effect of dilutive stock shares and units (in shares) 0.5 0.3 0.3 0.3
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 147.7 146.1 147.2 145.8
Diluted net earnings per common share (in dollars per share) $ 1.73 $ 0.63 $ 3.14 $ 1.87