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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense (benefit), including discontinued operations | $ 1.0 | $ (4.5) | $ 109.0 | $ (7.1)
Tax credit |  | $ 1.3 | $ 2.3 |
Corporate Tax Rate per The Tax Cuts and Jobs Acts (TTCJA) [Line Items] |  |  |  |
Provisional tax expense per the Tax Cuts Cuts and Jobs Act | $ 112.6 |  |  |
Maximum |  |  |  |
Corporate Tax Rate per The Tax Cuts and Jobs Acts (TTCJA) [Line Items] |  |  |  |
Corporate Tax Rate per The Tax Cuts and Jobs Acts (TTCJA) | 35.00% |  | 35.00% |
Minimum |  |  |  |
Corporate Tax Rate per The Tax Cuts and Jobs Acts (TTCJA) [Line Items] |  |  |  |
Corporate Tax Rate per The Tax Cuts and Jobs Acts (TTCJA) | 21.00% |  | 21.00% |

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- Definition Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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