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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, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, shares 356,667 339,131 344,844  
Outstanding, Weighted average grant date fair value per share $ 12.71 $ 12.09 $ 12.74 $ 11.51
Outstanding, Weighted average remaining contractual term 10 months 24 days 1 year 1 year 1 month 6 days 10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 236,250 294,063 203,834  
Granted, Weighted average grant date fair value per share $ 13.28 $ 11.53 $ 13.60  
Vested, shares (156,585) (156,012) (162,969)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1.9 $ 1.9 $ 1.6  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (20,952) (120,515) (46,578)  
Canceled, Weighted average grant date fair value per share $ 12.53 $ 12.22 $ 12.39  
Outstanding, shares 415,380 356,667 339,131 344,844