Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Details)

v2.4.0.8
Share-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Share-Based Compensation.      
Number of shares initially registered and authorized for issuance 12,685,436    
Total number of shares outstanding (in shares) 4,166,230    
Number of shares issued (in shares) 3,730,889    
Number of shares available for future issuance (in shares) 4,788,317    
Share-based compensation cost $ 7.5 $ 6.4 $ 8.7
Less impact of income tax 2.8 2.3 3.2
Share-based compensation cost, net of tax 4.7 4.1 5.5
Vested Deferred Stock      
Current tax benefit realized from the exercise of stock options and payment of restricted stock units 3.7    
Time Based Stock Awards [Member]
     
Weighted average exercise price      
Unrecognized stock-based compensation 2.3    
Period for recognition of unrecognized stock-based compensation 2 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) 113,074    
Granted (in shares) 99,518    
Vested (in shares) (73,865)    
Forfeited (in shares) (19,644)    
Number of shares outstanding under time-based stock awards and performance-based stock awards at the end of the period (in shares) 119,083 113,074  
Weighted-Average Grant Date Fair Value      
Non-vested time-based stock awards at the beginning of the period (in dollars per share) $ 20.59    
Granted (in dollars per share) $ 29.50 $ 22.25 $ 21.47
Vested (in dollars per share) $ 25.33    
Forfeited (in dollars per share) $ 20.67    
Non-vested time-based stock awards at the end of the period (in dollars per share) $ 25.09 $ 20.59  
Aggregate fair value 3.7    
Performance Shares [Member]
     
Weighted average exercise price      
Unrecognized stock-based compensation 4.6    
Period for recognition of unrecognized stock-based compensation 1 year 8 months 12 days    
Time-based stock awards and performance-based stock awards      
Performance measurement period used to determined shares granted included in 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) 1,406,994    
Granted (in shares) 583,573    
Vested (in shares) (98,702)    
Forfeited (in shares) (682,547)    
Number of shares outstanding under time-based stock awards and performance-based stock awards at the end of the period (in shares) 1,209,318 1,406,994  
Weighted-Average Grant Date Fair Value      
Non-vested time-based stock awards at the beginning of the period (in dollars per share) $ 21.49    
Granted (in dollars per share) $ 28.56 $ 20.76 $ 22.34
Vested (in dollars per share) $ 22.33    
Forfeited (in dollars per share) $ 22.57    
Non-vested time-based stock awards at the end of the period (in dollars per share) $ 24.22 $ 21.49  
Aggregate fair value 37.7    
Time Based Stock Awards And Performance Based Stock Awards [Member]
     
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 5.8 6.5 10.3
Weighted-Average Grant Date Fair Value      
Number of shares under the time-based and performance-based stock awards due to dividend reinvestment (in shares) 54,198    
Aggregate fair value of shares under the time-based and performance-based stock awards plans due to dividend reinvestment 1.7    
Vested Deferred Stock      
Vested deferred stock (in shares) 304,264    
Aggregate fair value of vested deferred stock 9.4    
Employee Stock Option [Member]
     
Share-based compensation      
Vesting period 3 years    
Weighted average fair value of options granted (in dollars per share) $ 6.97 $ 4.91 $ 5.88
Assumptions used in the determination of fair value of options      
Weighted-average dividend yield (as a percent) 2.80% 3.80% 3.40%
Weighted-average volatility factor (as a percent) 33.50% 34.90% 37.40%
Exercise factor (as a percent) 29.50% 32.10% 32.90%
Post-vesting termination rate (as a percent) 5.00% 5.00% 5.00%
Expected life 4 years 2 months 12 days 4 years 1 month 6 days 4 years 2 months 12 days
Number of shares      
Outstanding at the beginning of the period (in shares) 3,045,402    
Granted (in shares) 455,922    
Exercised (in shares) (914,113)    
Forfeited (in shares) (93,292)    
Expired (in shares) (14,552)    
Outstanding at the end of the period (in shares) 2,479,367 3,045,402  
Exercisable at the end of the period (in shares) 1,664,177    
Weighted average exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 21.13    
Granted (in dollars per share) $ 28.18    
Exercised (in dollars per share) $ 23.15    
Forfeited (in dollars per share) $ 24.69    
Expired (in dollars per share) $ 27.36    
Outstanding at the end of the period (in dollars per share) $ 21.52 $ 21.13  
Exercisable at the end of the period (in dollars per share) $ 19.95    
Unrecognized stock-based compensation 2.8    
Period for recognition of unrecognized stock-based compensation 1 year 10 months 24 days    
Average remaining life of outstanding stock options 5 years 9 months 18 days    
Aggregate intrinsic value of outstanding options 23.9    
Average remaining life of the exercisable options 4 years 7 months 6 days    
Aggregate intrinsic value of exercisable options 18.7    
Total intrinsic value of options exercised $ 6.1 $ 0.9 $ 0.7
Employee Stock Option [Member] | Minimum [Member]
     
Assumptions used in the determination of fair value of options      
Risk-free interest rate (as a percent) 0.10% 0.20% 0.10%
Employee Stock Option [Member] | Maximum [Member]
     
Share-based compensation      
Award expiration term 10 years    
Assumptions used in the determination of fair value of options      
Risk-free interest rate (as a percent) 2.80% 1.60% 2.00%