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Share Based Compensation (Details Textuals) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Share-Based Compensation (Textuals) [Abstract]      
Pre-tax share-based compensation expense $ 42.5 $ 41.1 $ 43.5
Income tax benefit related to share-based compensation expense, Total 12.9 12.5 13.8
Unrecognized compensation cost related to share-based compensation awards, net of estimated forfeitures, Total 38.3    
Weighted average period for recognition of total unrecognized compensation cost 1 year 8 months    
Payout percentage 180.00% 173.00% 200.00%
Payout percentage in December 2014 for performance period ending September 30, 2014 187.00%    
Stock Option [Member]
     
Share-Based Compensation (Textuals) [Abstract]      
Expiration Period 10 years    
Vesting period 3 years    
Per share weighted average fair value of stock options granted $ 34.03 $ 25.18 $ 23.49
Total intrinsic value of stock option exercised 108.1 131.7 43.9
Performance shares [Member]
     
Share-Based Compensation (Textuals) [Abstract]      
Vesting period 3 years    
Maximum potential shares to be delivered in payment under performance share awards 154,000    
Per share weighted average fair value $ 108.48 $ 98.15 $ 101.57
Vested shares, Total Fair Value 14.2 18.7 25.8
Restricted stock and restricted stock units [Member]
     
Share-Based Compensation (Textuals) [Abstract]      
Per share weighted average fair value $ 109.69 $ 80.17 $ 73.73
Vested shares, Total Fair Value $ 6.4 $ 9.4 $ 6.2
2012 Long Term Incentive Plan [Member]
     
Share-Based Compensation (Textuals) [Abstract]      
Shares authorized 6,800,000    
Shares available for grant 4,200,000    
2003 Directors Stock Incentive Plan [Member]
     
Share-Based Compensation (Textuals) [Abstract]      
Shares authorized 500,000    
Shares available for grant 300,000    
Minimum [Member]
     
Share-Based Compensation (Textuals) [Abstract]      
Payout percentage 0.00%    
Minimum [Member] | Restricted stock and restricted stock units [Member]
     
Share-Based Compensation (Textuals) [Abstract]      
Vesting period 1 year    
Maximum [Member]
     
Share-Based Compensation (Textuals) [Abstract]      
Payout percentage 200.00%    
Maximum [Member] | Restricted stock and restricted stock units [Member]
     
Share-Based Compensation (Textuals) [Abstract]      
Vesting period 5 years