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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, 2015
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, shares 643,288 608,982 358,866  
Outstanding, Weighted average grant date fair value per share $ 8.49 $ 6.22 $ 4.03 $ 2.03
Outstanding, Weighted average remaining contractual term 9 months 7 days 9 months 7 days 1 year 1 year 2 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 289,524 304,815 382,605  
Granted, Weighted average grant date fair value per share $ 9.78 $ 8.52 $ 5.22  
Vested, shares (317,409) (240,739) (119,637)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 3.1 $ 2.1 $ 0.7  
Canceled, shares (56,525) (29,770) (12,852)  
Canceled, Weighted average grant date fair value per share $ 8.29 $ 5.29 $ 2.03  
Outstanding, shares 558,878 643,288 608,982 358,866