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Discontinued Operations, Assets Held for Sale and Divestitures (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Jan. 06, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on sale of idle property | $ 0.0 | $ 0.0 | $ 9.0 | $ 0.0 |
Disposal Date |  | Jan. 06, 2017 |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  | $ (305.7)
Restructuring | 1.9 | $ 2.5 | 5.8 | 3.8 |
Revenue, Net | 233.2 | $ 199.7 | 411.5 | $ 366.9 |
Cash [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | (7.4) |  | (7.4) |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | (0.8) |  | (0.8) |  |
Property, Plant and Equipment [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | (0.4) |  | (0.4) |  |
Other Noncurrent Liabilities [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | $ (1.2) |  | $ (1.2) |  |

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