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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |
Income tax benefit, including discontinued operations | $ (108.0) | $ 2.6
Tax credit |  | $ 1.2
Corporate Tax Rate per The Tax Cuts and Jobs Acts (TTCJA) [Line Items] |  |
Valuation Allowances and Reserves, Period Increase (Decrease) | $ 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% |
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% |

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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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- Definition Amount of increase (decrease) in allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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