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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, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, shares 262,773 352,007 534,026  
Outstanding, Weighted average grant date fair value per share $ 11.39 $ 12.12 $ 11.36 $ 9.60
Outstanding, Weighted average remaining contractual term 21 hours 14 hours 21 hours 21 hours
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 180,747 163,199 199,260  
Granted, Weighted average grant date fair value per share $ 10.53 $ 12.40 $ 13.22  
Vested, shares (132,289) (170,675) (278,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1.4 $ 2.1 $ 3.7  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (55,077) (81,758) (103,279)  
Canceled, Weighted average grant date fair value per share $ 11.61 $ 12.10 $ 10.87  
Outstanding, shares 256,154 262,773 352,007 534,026