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Share-Based Compensation (Details Textuals) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Pre-tax share-based compensation expense $ 40.5 $ 41.5 $ 42.5
Income tax benefit related to share-based compensation expense, Total 12.9 $ 13.2 $ 12.9
Unrecognized compensation cost related to share-based compensation awards, net of estimated forfeitures, Total $ 34.5    
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 $ 21.28 $ 26.70 $ 34.03
Total intrinsic value of stock options exercised $ 21.9 $ 46.1 $ 108.1
Performance shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Vesting period 3 years    
Payout percentage 93.00% 187.00% 180.00%
Payout percentage in December 2016 for performance period ending September 30, 2016 10.00%    
Maximum potential shares to be delivered in payment under performance share awards 7    
Granted, shares 96    
Vested shares, Total Fair Value $ 7.1 $ 17.2 $ 14.2
Weighted average grant date fair value of awards granted $ 87.64 $ 103.70 $ 108.48
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 65    
Vested shares, Total Fair Value $ 7.0 $ 8.0 $ 6.4
Weighted average grant date fair value of awards granted $ 105.38 $ 115.02 $ 109.69
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 10    
Weighted average grant date fair value of awards granted $ 98.79 $ 111.43 $ 108.86
2012 Long Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]      
Shares authorized 11,800    
Shares available for grant 6,400    
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