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Share-Based Compensation (Details Textuals) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Pre-tax share-based compensation expense $ 41.5 $ 42.5 $ 41.1
Income tax benefit related to share-based compensation expense, Total 13.2 $ 12.9 $ 12.5
Unrecognized compensation cost related to share-based compensation awards, net of estimated forfeitures, Total $ 36.8    
Weighted average period for recognition of total unrecognized compensation cost 1 year 7 months    
Stock options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Expiration period 10 years    
Vesting period 3 years    
Per share weighted average fair value of stock options granted $ 26.70 $ 34.03 $ 25.18
Total intrinsic value of stock option exercised $ 46.1 $ 108.1 $ 131.7
Performance shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Vesting period 3 years    
Payout percentage 187.00% 180.00% 173.00%
Payout percentage in December 2015 for performance period ending September 30, 2015 93.00%    
Maximum potential shares to be delivered in payment under performance share awards 68    
Granted, shares 87    
Vested shares, Total Fair Value $ 17.2 $ 14.2 $ 18.7
Weighted average grant date fair value of awards granted $ 103.70 $ 108.48 $ 98.15
Performance shares [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Payout percentage 0.00%    
Performance shares [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Payout percentage 200.00%    
Restricted stock and restricted stock units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Granted, shares 52    
Vested shares, Total Fair Value $ 8.0 $ 6.4 $ 9.4
Weighted average grant date fair value of awards granted $ 115.02 $ 109.69 $ 80.17
Restricted stock and restricted stock units [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Vesting period 1 year    
Restricted stock and restricted stock units [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Vesting period 5 years    
Unrestricted stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Granted, shares 7    
Weighted average grant date fair value of awards granted $ 111.43 $ 108.86 $ 76.65
2012 Long Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Shares authorized 6,800    
Shares available for grant 2,800    
2003 Directors Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Shares authorized 500    
Shares available for grant 300