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Net Earnings per Common Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator:      
Net earnings $ 341.6 $ 491.6 $ 506.8
Distributed and allocated undistributed net earnings to unvested restricted stockholders 0.0 0.0 0.0
Net Income (Loss) Available to Common Stockholders, Basic, Total $ 341.6 $ 491.6 $ 506.8
Denominator      
Weighted average number of common shares outstanding - basic (in shares) 144,400,000 145,900,000 150,900,000
Basic net earnings per common share      
Basic net earnings per common share (in dollars per share) $ 2.37 $ 3.37 $ 3.36
Numerator:      
Net earnings available to common stockholders $ 341.6 $ 491.6 $ 506.8
Denominator:      
Weighted average number of common shares outstanding - basic (in shares) 144,400,000 145,900,000 150,900,000
Effect of dilutive stock shares and units (in shares) 500,000 1,500,000 1,500,000
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 144,900,000 147,400,000 152,400,000
Diluted net earnings per common share - (in dollars per share) $ 2.36 $ 3.33 $ 3.32
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Diluted (in shares) 144,900,000 147,400,000 152,400,000
PSU Awards      
Denominator:      
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 200,000 800,000 600,000
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Diluted (in shares) 200,000 800,000 600,000
SLO Awards      
Denominator:      
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 0 0 0
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Diluted (in shares) 0 0 0