| Income Tax (Details) - USD ($) $ in Millions | 3 Months Ended | |
|---|---|---|
| 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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- Definition Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Deferred Tax Liability, Income Tax (Expense) Benefit No definition available. 
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- Definition Tax Cuts And Jobs Act Of 2017 Transition Tax For Accumulated Foreign Earnings Income Tax Expense (Benefit) No definition available. 
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- References No definition available. 
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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