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Earnings per Share (Schedule of Weighted-Average Shares Outstanding) (Details) - shares
shares in Millions
3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Weighted Average Number Of Shares [Line Items]    
Basic weighted-average shares outstanding (in shares) 48.7 50.1
Effect of dilutive securities (in shares) 0.0 0.4
Diluted weighted-average shares outstanding (in shares) 48.7 50.5
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Earnings Per Share, Potentially Dilutive Securities 0.5  
RSE and PRSE awards    
Schedule Of Weighted Average Number Of Shares [Line Items]    
Effect of dilutive securities (in shares) 0.0 0.4
Share options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive awards excluded from the calculation of diluted weighted-average shares outstanding (in shares) 1.4 1.9