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Stock-based Compensation Plans (Schedule of Share-based Compensation. Option Activity (Details) - 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 4,552,235 5,124,706 5,522,610  
Outstanding, Weighted average exercise price (per share) $ 6.54 $ 6.37 $ 6.22 $ 6.30
Outstanding, Weighted average remaining contractual term, years 4 years 2 months 1 day 5 years 11 days 5 years 11 months 6 years 10 months
Outstanding, Aggregate intrinsic value $ 9.3 $ 13.6 $ 14.6 $ 3.5
Granted, shares 97,119 86,904 125,780  
Granted, Weighted average exercise price (per share) $ 9.97 $ 8.58 $ 5.91  
Exercised, shares (506,632) (587,964) (384,475)  
Exercised, Weighted average exercise price (per share) $ 3.42 $ 4.61 $ 4.97  
Exercised, Aggregate intrinsic value $ 3.2 $ 0.0 $ 1.2  
Canceled, shares (150,056) (71,411) (139,209)  
Canceled, Weighted average exercise price (per share) $ 13.90 $ 12.92 $ 12.52  
Stock Options, Exercisable, Number 3,799,877      
Exercisable, Weighted average exercise price (per share) $ 6.43      
Exercisable, Weighted average remaining contractual term, years 3 years 11 months 4 days      
Exercisable, Aggregate intrinsic value $ 9.3      
Expected to vest in subsequent periods, shares 192,789      
Expected to vest in subsequent periods, Weighted average exercise price (per share) $ 8.76      
Expected to vest in subsequent periods, Weighted average remaining contractual term, years 8 years 7 months 10 days      
Expected to vest in subsequent periods, Aggregate intrinsic value $ 0.1      
Outstanding, shares 3,992,666 4,552,235 5,124,706 5,522,610