v3.24.1.u1
Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Earnings (Loss) Per Share, Diluted, by Common Class, Including Two Class Method        
Net Earnings $ 97.2 $ 54.1 $ 185.3 $ 146.0
Impact of redeemable NCI 0.0 3.4 0.0 9.1
Net (loss) earnings for basic (loss) earnings per share 97.2 57.5 185.3 155.1
Impact of interest expense, net of tax, related to convertible senior notes 2.7 2.7 5.4 5.4
Net (loss) earnings for diluted (loss) earnings per share $ 99.9 $ 60.2 $ 190.7 $ 160.5
Weighted-average shares for basic earnings per share 60.8 58.8 60.6 58.8
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 5.4 5.4 5.4 5.4
Weighted Average Number of Shares Outstanding, Diluted, Adjustment 6.8 6.9 6.9 7.0
Weighted-average shares for diluted earnings per share 67.6 65.7 67.5 65.8
Basic earnings per share (in usd per share) $ 1.60 $ 0.98 $ 3.06 $ 2.64
Diluted earnings per share (in usd per share) $ 1.48 $ 0.92 $ 2.83 $ 2.44
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 0.3 0.3 0.3 0.4
Stock Appreciation Rights        
Earnings (Loss) Per Share, Diluted, by Common Class, Including Two Class Method        
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 0.0 0.1 0.0 0.1
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 0.4 0.4 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 0.8 0.6 0.7 0.5
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 0.0 0.1 0.1 0.1