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Income Tax (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Effective income tax rate reconciliation, percent | 26.20% | 24.90%
Tax cuts and jobs act of 2017, transition tax for accumulated foreign earnings income tax expense (benefit) |  | $ 9.5
Tax cuts and jobs act of 2017, change in tax rate, deferred tax liability, income tax (expense) benefit |  | 10.6
Income taxes paid | $ 7.1 | $ 4.0

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