v3.25.4
Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Earnings (Loss) Per Share, Diluted, by Common Class, Including Two Class Method    
Net Earnings $ 96.8 $ 113.3
Net earnings for basic earnings per share 96.8 113.3
Impact of interest expense, net of tax, related to convertible senior notes 2.7 2.7
Net earnings for diluted earnings per share $ 99.5 $ 116.0
Weighted-average shares for basic earnings per share 51.7 58.3
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 5.4 5.4
Weighted Average Number of Shares Outstanding, Diluted, Adjustment 6.5 6.9
Weighted-average shares for diluted earnings per share 58.2 65.2
Basic earnings per share (in usd per share) $ 1.87 $ 1.94
Diluted earnings per share (in usd per share) $ 1.71 $ 1.78
Stock Options    
Earnings (Loss) Per Share, Diluted, by Common Class, Including Two Class Method    
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0.1 0.2
Restricted Stock Awards    
Earnings (Loss) Per Share, Diluted, by Common Class, Including Two Class Method    
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0.3 0.5
Market-based performance shares    
Earnings (Loss) Per Share, Diluted, by Common Class, Including Two Class Method    
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0.6 0.7
Earnings-based performance shares    
Earnings (Loss) Per Share, Diluted, by Common Class, Including Two Class Method    
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0.1 0.1