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Share-Based Compensation (Tables)
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6 Months Ended |
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Mar. 31, 2015
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| Share-Based Compensation [Abstract] |
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| Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
| Share-based compensation cost recognized in the consolidated income statements is summarized below: | | | | | | | | | | | | | | | | | | | Three Months Ended | | | | Six Months Ended | | | | | 31 March | | | | 31 March | | | | | 2015 | | | 2014 | | | | 2015 | | | 2014 | | | Before-Tax Share-Based Compensation Cost | $ | 12.9 | | $ | 11.6 | | | $ | 24.8 | | $ | 23.4 | | | Income Tax Benefit | | (4.7) | | | (3.9) | | | | (8.7) | | | (8.2) | | | After-Tax Share-Based Compensation Cost | $ | 8.2 | | $ | 7.7 | | | $ | 16.1 | | $ | 15.2 | | | | | | | | | | | | | | | | |
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| Schedule Of Share Based Payment Award, Market-Based Deferred Stock Units, Valuation Assumptions [Table Text Block] |
| | | | | | Expected volatility | | 19.6 | % | | Risk-free interest rate | | .9 | % | | Expected dividend yield | | 2.5 | % |
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| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| | | | | Expected volatility | 30.3 | % | | Expected dividend yield | 2.6 | % | | Expected life (in years) | 7.5 | | | Risk-free interest rate | 2.2 | % |
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