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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2015
Income Tax Disclosure [Abstract] |  |  |
Income tax expense | $ 83.6 | $ 78.2 |
Effective tax rate (percent) | 34.60% | 35.40% |
Deferred tax assets net of DTL | $ 552.3 |  | $ 568.2
Valuation allowance for deferred income taxes | $ 10.1 |  | $ 10.1

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