Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details)

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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Share-Based Compensation      
Number of shares originally registered and authorized for issuance 8,785,436    
Total number of shares outstanding (in shares) 4,289,413    
Number of shares issued (in shares) 980,043    
Number of shares available for future issuance (in shares) 3,516,250    
Stock-based compensation costs $ 11.7 $ 7.6 $ 6.7
Less:Income tax benefit 4.3 2.6 2.5
Stock-based compensation costs, net-of-tax 7.4 5.0 4.2
Current tax benefit realized from the exercise of stock options and payment of restricted stock units 0.4    
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 9.7 1.9 2.0
Weighted-Average Grant Date Fair Value      
Number of shares under the time-based stock awards and performance-based stock awards due to dividend reinvestment (in shares) 63,870    
Aggregate intrinsic value of shares under the time-based stock awards and performance-based stock awards plans due to dividend reinvestment 1.2    
Vested Deferred Stock      
Vested deferred stock (in shares) 278,085    
Aggregate intrinsic value of vested deferred stock 5.1    
Time-based stock awards
      
Weighted average exercise price      
Unrecognized stock-based compensation 2.7    
Period for recognition of unrecognized stock-based compensation (in years) 2.5    
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) 125,986    
Granted (in shares) 140,652    
Vested (in shares) (72,344)    
Forfeited (in shares) (17,152)    
Number of shares outstanding under time-based stock awards and performance-based stock awards at the end of the period (in shares) 177,142    
Weighted-Average Grant Date Fair Value      
Non-vested time-based stock awards at the beginning of the period (in dollars per share) $ 22.85    
Granted (in dollars per share) $ 21.38    
Vested (in dollars per share) $ 22.19    
Forfeited (in dollars per share) $ 22.02    
Non-vested time-based stock awards at the end of the period (in dollars per share) $ 22.03    
Aggregate intrinsic value 3.3    
Performance-based stock awards
      
Stock based compensation      
Vesting period (in years) 3    
Weighted average exercise price      
Unrecognized stock-based compensation 5.5    
Period for recognition of unrecognized stock-based compensation (in years) 1.5    
Award expiration date (in years) 3    
Time-based stock awards and performance-based stock awards      
Period used for hurdle rate and the corresponding service requirement (in years) 3    
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) 1,020,599    
Granted (in shares) 587,481    
Vested (in shares) (374,087)    
Forfeited (in shares) (205,323)    
Number of shares outstanding under time-based stock awards and performance-based stock awards at the end of the period (in shares) 1,028,670    
Weighted-Average Grant Date Fair Value      
Non-vested time-based stock awards at the beginning of the period (in dollars per share) $ 16.80    
Granted (in dollars per share) $ 19.66    
Vested (in dollars per share) $ 14.89    
Forfeited (in dollars per share) $ 16.16    
Non-vested time-based stock awards at the end of the period (in dollars per share) $ 19.26    
Aggregate intrinsic value 19.1    
Stock options
      
Stock based compensation      
Vesting period, minimum (in years) 1    
Vesting period, maximum (in years) 3    
Vesting period (in years) 10    
Weighted average fair value of options granted (in dollars per share) $ 5.67 $ 5.71 $ 3.97
Assumptions used in the determination of fair value of options      
Risk-free interest rate, low end of range (as a percent) 0.30% 0.30% 0.40%
Risk-free interest rate, high end of range (as a percent) 3.50% 4.00% 2.90%
Weighted average dividend yield (as a percent) 3.80% 4.00% 5.00%
Weighted average volatility factor (as a percent) 41.10% 42.20% 41.50%
Exercise factor (as a percent) 34.40% 35.70% 36.30%
Post-vesting termination rate (as a percent) 5.00% 5.00% 5.00%
Expected life (years) 4.2 4.2 4.1
Number of shares      
Outstanding at the beginning of the period (in shares) 2,374,286    
Granted (in shares) 555,679    
Exercised (in shares) (48,837)    
Forfeited (in shares) (62,038)    
Expired (in shares) (77,714)    
Outstanding at the end of the period (in shares)   2,374,286  
Exercisable at the end of the period (in shares) 1,792,600    
Weighted average exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 21.38    
Granted (in dollars per share) $ 19.78    
Exercised (in dollars per share) $ 19.06    
Forfeited (in dollars per share) $ 20.10    
Expired (in dollars per share) $ 22.38    
Outstanding at the end of the period (in dollars per share) $ 21.10 $ 21.38  
Exercisable at the end of the period (in dollars per share) $ 22.35    
Unrecognized stock-based compensation 2.4    
Period for recognition of unrecognized stock-based compensation (in years) 1.7    
Average remaining life of outstanding stock options (in years) 6.2    
Aggregate intrinsic value of outstanding options 1.7    
Average remaining life of the exercisable options (in years) 4.8    
Aggregate intrinsic value of exercisable options 1.1    
Total intrinsic value of options exercised $ 0.1 $ 0.4 $ 0.2
Award expiration date (in years) 10