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Discontinued Operations - Narrative (Details) - Disposed of by Sale - Darex - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 03, 2017
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Consideration received/receivable for disposal $ 1,060.0        
After-tax gain on sale   $ 18.8 $ 7.2 $ 29.1  
Reduction in deferred consideration     13.1    
Provision for income taxes of discontinued operations   $ 6.2 2.4 $ 14.4  
Term of transition services agreement 36 months        
Indemnification payable     0.9   $ 0.9
Other current liabilities          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal group, deferred consideration     $ 0.5   $ 13.6