Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Details)

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Share-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Share-Based Compensation      
Number of shares initially registered and authorized for issuance 8,785,436    
Total number of shares outstanding (in shares) 4,905,141    
Number of shares issued (in shares) 2,066,903    
Number of shares available for future issuance (in shares) 1,813,392    
Stock-based compensation cost $ 6.4 $ 8.7 $ 11.7
Less impact of income tax 2.3 3.2 4.3
Stock-based compensation cost, net of tax 4.1 5.5 7.4
Current tax benefit realized from the exercise of stock options and payment of restricted stock units 4.8    
Stock options
     
Stock based compensation      
Vesting period 3 years    
Weighted average fair value of options granted (in dollars per share) $ 4.91 $ 5.88 $ 5.67
Assumptions used in the determination of fair value of options      
Weighted-average dividend yield (as a percent) 3.80% 3.40% 3.80%
Weighted-average volatility factor (as a percent) 34.90% 37.40% 41.10%
Exercise factor (as a percent) 32.10% 32.90% 34.40%
Post-vesting termination rate (as a percent) 5.00% 5.00% 5.00%
Expected life 4 years 1 month 6 days 4 years 2 months 12 days 4 years 2 months 12 days
Number of shares      
Outstanding at the beginning of the period (in shares) 2,873,954    
Granted (in shares) 508,650    
Exercised (in shares) (189,199)    
Forfeited (in shares) (34,345)    
Expired (in shares) (113,658)    
Outstanding at the end of the period (in shares) 3,045,402 2,873,954  
Exercisable at the end of the period (in shares) 2,060,321    
Weighted average exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 21.18    
Granted (in dollars per share) $ 20.78    
Exercised (in dollars per share) $ 20.16    
Forfeited (in dollars per share) $ 20.96    
Expired (in dollars per share) $ 22.51    
Outstanding at the end of the period (in dollars per share) $ 21.13 $ 21.18  
Exercisable at the end of the period (in dollars per share) $ 21.11    
Unrecognized stock-based compensation 2.3    
Period for recognition of unrecognized stock-based compensation 1 year 7 months 6 days    
Average remaining life of outstanding stock options 6 years    
Aggregate intrinsic value of outstanding options 19.0    
Average remaining life of the exercisable options 4 years 10 months 24 days    
Aggregate intrinsic value of exercisable options 12.9    
Total intrinsic value of options exercised 0.9 0.7 0.1
Stock options | Minimum
     
Assumptions used in the determination of fair value of options      
Risk-free interest rate (as a percent) 0.20% 0.10% 0.30%
Stock options | Maximum
     
Stock based compensation      
Award expiration term 10 years    
Assumptions used in the determination of fair value of options      
Risk-free interest rate (as a percent) 1.60% 2.00% 3.50%
Time-Based stock awards
     
Stock based compensation      
Weighted average fair value of options granted (in dollars per share)   $ 21.47 $ 21.38
Weighted average exercise price      
Unrecognized stock-based compensation 1.6    
Period for recognition of unrecognized stock-based compensation 2 years 1 month 6 days    
Number of shares      
Number of shares outstanding under time-based stock awards and performance-based stock awards at the beginning of the period (in shares) 158,249    
Granted (in shares) 82,830    
Vested (in shares) (115,995)    
Forfeited (in shares) (12,010)    
Number of shares outstanding under time-based stock awards and performance-based stock awards at the end of the period (in shares) 113,074 158,249  
Weighted-Average Grant Date Fair Value      
Non-vested time-based stock awards at the beginning of the period (in dollars per share) $ 21.30    
Granted (in dollars per share) $ 22.25    
Vested (in dollars per share) $ 22.72    
Forfeited (in dollars per share) $ 20.82    
Non-vested time-based stock awards at the end of the period (in dollars per share) $ 20.59 $ 21.30  
Aggregate fair value 3.1    
Performance-based stock awards (maximum that can be earned)
     
Stock based compensation      
Weighted average fair value of options granted (in dollars per share)   $ 22.34 $ 19.66
Weighted average exercise price      
Unrecognized stock-based compensation 3.3    
Period for recognition of unrecognized stock-based compensation 1 year 7 months 6 days    
Time-based stock awards and performance-based stock awards      
Period used for vesting criteria of performance-based stock awards 3 years    
Number of shares      
Number of shares outstanding under time-based stock awards and performance-based stock awards at the beginning of the period (in shares) 1,215,459    
Granted (in shares) 778,942    
Vested (in shares) (70,460)    
Forfeited (in shares) (516,947)    
Number of shares outstanding under time-based stock awards and performance-based stock awards at the end of the period (in shares) 1,406,994 1,215,459  
Weighted-Average Grant Date Fair Value      
Non-vested time-based stock awards at the beginning of the period (in dollars per share) $ 21.14    
Granted (in dollars per share) $ 20.76    
Vested (in dollars per share) $ 19.69    
Forfeited (in dollars per share) $ 19.82    
Non-vested time-based stock awards at the end of the period (in dollars per share) $ 21.49 $ 21.14  
Aggregate fair value 38.5    
Time-based stock awards and performance-based stock awards
     
Time-based stock awards and performance-based stock awards      
Total vest date fair value of vested time-based stock awards and performance-based stock awards shares held by employees and directors 6.5 10.3 9.8
Weighted-Average Grant Date Fair Value      
Number of shares under the time-based and performance-based stock awards due to dividend reinvestment (in shares) 77,974    
Aggregate fair value of shares under the time-based and performance-based stock awards plans due to dividend reinvestment 2.1    
Vested Deferred Stock      
Vested deferred stock (in shares) 261,697    
Aggregate fair value of vested deferred stock $ 7.2