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Stock-based Compensation Plans (Schedule of Share-based Compensation, Phantom Award Activity) (Details) - Phantom Share Units (PSUs) [Member] - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, shares 339,131 344,844 314,475  
Outstanding, Weighted average grant date fair value per share $ 12.09 $ 12.74 $ 11.51 $ 11.16
Outstanding, Weighted average remaining contractual term 1 year 1 year 1 month 6 days 10 months 24 days 10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 294,063 203,834 185,808  
Granted, Weighted average grant date fair value per share $ 11.53 $ 13.60 $ 11.91  
Vested, shares (156,012) (162,969) (131,182)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1.9 $ 1.6 $ 1.6  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (120,515) (46,578) (24,257)  
Canceled, Weighted average grant date fair value per share $ 12.22 $ 12.39 $ 11.30  
Outstanding, shares 356,667 339,131 344,844 314,475