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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Sep. 30, 2019
Income tax expense | $ 20.7 | $ 39.7 |  |
Effective income tax rate (as a percent) | 21.40% | 26.90% |  |
Income tax expense (benefit), tax credit, discrete items | $ (1.1) | $ 7.3 |  |
Employee share-based payments, benefit | (1.5) |  |  |
Income tax expense (benefit) related to uncertain tax position reserve |  | 6.2 |  |
Tax cuts and jobs act, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense |  | 0.8 |  |
Unrecognized tax benefits | 106.0 |  |  | $ 97.3
Net unrecognized tax benefits, excluding interest and penalties that would affect the company's net income if recognized | 21.4 |  |  |
Interest and penalties | (0.1) | $ 0.2 |  |
Accruals for payment of interest and penalties | $ 4.3 |  |  |
Scenario Forecast |  |  |  |
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit |  |  | $ 7.2 |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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