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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Sep. 30, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ 128.8 | $ 112.4 | $ 317.8 | $ 272.8 |
Effective tax rate (percent) | 34.00% | 33.70% | 34.50% | 34.80% |
Deferred tax assets net of DTL | $ 514.3 |  | $ 514.3 |  | $ 568.2
Valuation allowance for deferred income taxes | $ 9.2 |  | $ 9.2 |  | $ 10.1

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