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Income Tax (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate reconciliation, percent | 23.40% | 24.10% | 24.80% | 24.50%
Tax cuts and jobs act of 2017, transition tax for accumulated foreign earnings income tax expense (benefit) |  | $ 9.5 | $ 9.5 | $ 9.5
Tax cuts and jobs act of 2017, change in tax rate, deferred tax liability, income tax (expense) benefit |  | $ (10.6) | 10.6 | (10.6)
Income taxes paid |  |  | $ 37.2 | $ 28.5

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