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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)