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Sale of Business (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 16, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Divestiture of Business, Sale Price   $ 245.0      
Proceeds from sale of business, net   141.2 $ 47.1 $ 5.9  
Impairment of Long-Lived Assets to be Disposed of $ (225.0)        
Gain (loss) on sale of business   (21.3) 15.5 0.0  
Accounts receivable, net         $ 84.9
Inventories         32.6
Prepaid expenses and other         2.1
Property, plant and equipment, net         191.8
Intangible assets, net         158.2
Other assets and deferred charges         81.7
Total assets disposed         326.3
Accounts payable         71.7
Accrued compensation and benefits         6.9
Accrued expenses and other         4.5
Postretirement benefits and other long-term liabilities         20.1
Total liabilities disposed         $ 103.2
Cash [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from Divestiture of Businesses   185.0      
Twelve year deferred payment obligation at 6% [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Noncash or Part Noncash Divestiture, Amount of Consideration Received   $ 60.0 $ 0.0 $ 0.0