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Stock-based Compensation Plans (Schedule of Share-based Compensation. Option Activity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding, shares 5,124,706 5,522,610 5,625,133   4,552,235
Outstanding, Weighted average exercise price (per share) $ 6.37 $ 6.22 $ 6.30 $ 6.74  
Outstanding, Weighted average remaining contractual term, years 5 years 0 months 11 days 5 years 11 months 6 years 10 months 7 years 6 months  
Outstanding, Aggregate intrinsic value $ 13.6 $ 14.6 $ 3.5 $ 0  
Granted, shares 86,904 125,780 677,117    
Granted, Weighted average exercise price (per share) $ 8.58 $ 5.91 $ 2.18    
Exercised, shares (587,964) (384,475) (8,552)    
Exercised, Weighted average exercise price (per share) $ 4.61 $ 4.97 $ 3.59    
Exercised, Aggregate intrinsic value 0 1.2 0    
Canceled, shares (71,411) (139,209) (771,088)    
Canceled, Weighted average exercise price (per share) $ 12.92 $ 12.52 $ 5.97    
Stock Options, Exercisable, Number 4,151,589        
Exercisable, Weighted average exercise price (per share) $ 6.56        
Exercisable, Weighted average remaining contractual term, years 4 years 9 months 4 days        
Exercisable, Aggregate intrinsic value 12.0        
Expected to vest in subsequent periods, shares 400,136        
Expected to vest in subsequent periods, Weighted average exercise price (per share) $ 4.32        
Expected to vest in subsequent periods, Weighted average remaining contractual term, years 7 years 10 months 20 days        
Expected to vest in subsequent periods, Aggregate intrinsic value $ 1.6