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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2021 | Sep. 30, 2019
Income tax expense | $ 28.0 | $ 53.7 | $ 87.0 | $ 129.6 |  |
Effective income tax rate (as a percent) | 25.80% | 21.80% | 27.80% | 23.20% |  |
Income tax expense (benefits), tax credit, discrete items |  | $ (1.2) | $ 10.1 | $ 5.9 |  |
Income tax expense (benefit) related to uncertain tax position reserve |  |  | 1.9 | 4.6 |  |
Effective income tax rate reconciliation, other reconciling items, amount | $ (2.0) | (0.4) | (2.0) | (1.5) |  |
Effective income tax rate reconciliation, change in enacted tax rate, amount |  | (0.4) |  | 1.3 |  |
Effective income tax rate reconciliation, tax expense (benefit), share-based payment arrangement, amount |  | $ (0.3) | (2.6) | (1.4) |  |
Tax cuts and jobs act, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense |  |  |  | 1.9 |  |
Unrecognized tax benefits | 100.5 |  | 100.5 |  |  | $ 97.3
Net unrecognized tax benefits, excluding interest and penalties that would affect the company's net income if recognized | 21.4 |  | 21.4 |  |  |
Interest and penalties |  |  | 1.0 | $ 0.6 |  |
Accruals for payment of interest and penalties | $ 5.4 |  | 5.4 |  |  |
Scenario Forecast |  |  |  |  |  |
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit |  |  |  |  | $ 9.0 |
Europe |  |  |  |  |  |
Valuation allowance on foreign net deferred tax assets |  |  | $ 11.4 |  |  |

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- Definition Amount of reasonable estimate for income tax expense from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act for which accounting for tax effect is incomplete. + References No definition available. + Details
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