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Earnings per Share - Components of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share Reconciliation [Abstract]      
Net Income (Loss) $ 524.9 $ 464.8 $ 882.8
Less: allocation of earnings to participating nonvested stock and stock unit awards - basic 53.2 32.6 37.7
Less: allocation of earnings to participating nonvested stock and stock unit awards - diluted 53.2 32.6 37.7
Net Income Available to Common Stockholders - basic 471.7 432.2 845.1
Net Income Available to Common Stockholders - diluted $ 471.7 $ 432.2 $ 845.1
Weighted-average shares outstanding – basic 516.7 509.5 490.0
Dilutive effect of nonparticipating nonvested stock unit awards 0.7 0.8 0.8
Weighted-Average Shares Outstanding – Diluted 517.4 510.3 490.8
Earnings per Share [Abstract]      
Basic $ 0.91 $ 0.85 $ 1.72
Diluted $ 0.91 $ 0.85 $ 1.72