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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, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, shares 3,992,666 4,552,235 5,124,706  
Outstanding, Weighted average exercise price (per share) $ 5.99 $ 6.54 $ 6.37 $ 6.22
Outstanding, Weighted average remaining contractual term, years 3 years 5 months 4 years 2 months 5 years 5 years 11 months
Outstanding, Aggregate intrinsic value $ 23.8 $ 9.3 $ 13.6 $ 14.6
Granted, shares 0 97,119 86,904  
Granted, Weighted average exercise price (per share) $ 0.00 $ 9.97 $ 8.58  
Exercised, shares (270,599) (506,632) (587,964)  
Exercised, Weighted average exercise price (per share) $ 6.83 $ 3.42 $ 4.61  
Exercised, Aggregate intrinsic value $ 0.8 $ 3.2 $ 0.0  
Canceled, shares (167,759) (150,056) (71,411)  
Canceled, Weighted average exercise price (per share) $ 17.82 $ 13.90 $ 12.92  
Stock Options, Exercisable, Number 3,471,004      
Exercisable, Weighted average exercise price (per share) $ 5.90      
Exercisable, Weighted average remaining contractual term, years 3 years 3 months      
Exercisable, Aggregate intrinsic value $ 23.5      
Expected to vest in subsequent periods, shares 83,304      
Expected to vest in subsequent periods, Weighted average exercise price (per share) $ 9.54      
Expected to vest in subsequent periods, Weighted average remaining contractual term, years 8 years      
Expected to vest in subsequent periods, Aggregate intrinsic value $ 0.3      
Outstanding, shares 3,554,308 3,992,666 4,552,235 5,124,706