v3.25.1
Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share, Diluted, by Common Class, Including Two Class Method        
Net earnings $ 58.7 $ 57.2 $ 135.6 $ 101.1
Weighted Average shares of Common Stock Outstanding, basic (in shares) 128.2 131.0 128.5 131.1
Weighted-Average shares of Common Stock Outstanding, diluted (in shares) 129.9 133.0 130.5 133.0
Earnings per share of Common Stock, basic (in USD per share) $ 0.46 $ 0.44 $ 1.06 $ 0.77
Earnings per share of Common Stock, diluted (in USD per share) $ 0.45 $ 0.43 $ 1.04 $ 0.76
Antidilutive securities excluded from computation of earnings per share, amount 0.0 0.0 0.0 0.0
Stock options        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method        
Dilutive restricted stock units, (in shares) 0.2 0.2 0.2 0.2
Restricted Stock Units (RSUs)        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method        
Dilutive restricted stock units, (in shares) 0.3 0.3 0.3 0.3
Performance-Based Restricted Stock Units        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method        
Dilutive restricted stock units, (in shares) 1.2 1.5 1.5 1.4