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Net Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator:      
Net earnings $ 264.7 $ 341.6 $ 491.6
Distributed and allocated undistributed net earnings to unvested restricted stockholders 0.0 0.0 0.0
Net earnings available to common stockholders $ 264.7 $ 341.6 $ 491.6
Denominator:      
Weighted average number of common shares outstanding - basic (in shares) 145.5 144.4 145.9
Basic net earnings per common share:      
Basic net earnings per common share (in dollars per share) $ 1.82 $ 2.37 $ 3.37
Numerator:      
Net earnings available to common stockholders $ 264.7 $ 341.6 $ 491.6
Denominator:      
Weighted average number of common shares outstanding - basic (in shares) 145.5 144.4 145.9
Effect of dilutive stock shares and units (in shares) 0.5 0.5 1.5
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 146.0 144.9 147.4
Diluted net earnings per common share - (in dollars per share) $ 1.81 $ 2.36 $ 3.33
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Diluted (in shares) 146.0 144.9 147.4
PSU Awards      
Denominator:      
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 0.0 0.2 0.8
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Diluted (in shares) 0.0 0.2 0.8
SLO Awards      
Denominator:      
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 0.0 0.0 0.0
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Diluted (in shares) 0.0 0.0 0.0