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Stock-based Compensation Plans (Schedule of Share-based Compensation, Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs, Outstanding, Number 396,097 408,506 437,022 481,562
Outstanding, Weighted average grant date fair value per share $ 11.78 $ 11.41 $ 11.31 $ 12.14
Outstanding, Weighted average remaining contractual term 9 months 18 days 10 months 24 days 10 months 24 days 1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 220,795 301,979 233,830  
Granted, Weighted average grant date fair value per share $ 12.29 $ 11.55 $ 10.10  
Settlement of performance-based restricted stock units, net of shares withheld for taxes 228,121 295,241 259,107  
RSUs, Vested in Period, Weighted Average Grant Date Fair Value $ 11.62 $ 11.40 $ 11.75  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 2.8 $ 3.4 $ 2.6  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (5,083) (35,254) (19,263)  
Canceled, Weighted average grant date fair value per share $ 11.41 $ 11.48 $ 11.43