v3.26.1
Earnings per Share (Schedule of Weighted-Average Shares Outstanding) (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Schedule Of Weighted Average Number Of Shares [Line Items]        
Basic weighted-average shares outstanding (in shares) 46.1 46.8 46.4 47.8
Effect of dilutive securities (in shares) 0.5 0.2 0.0 0.2
Diluted weighted-average shares outstanding (in shares) 46.6 47.0 46.4 48.0
Option, RSE and PRSE awards        
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) 1.2 2.0    
RSE awards        
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)     2.1 1.5
Option, RSE and PRSE awards        
Schedule Of Weighted Average Number Of Shares [Line Items]        
Effect of dilutive securities (in shares) 0.5 0.2 0.0 0.2