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Acquisitions (Purchase Price) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Feb. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill $ 103.4   $ 100.2 $ 86.6
CDF        
Business Acquisition [Line Items]        
Net working capital   $ 20.8    
Property, plant and equipment   21.4    
Intangible assets   0.9    
Goodwill   3.6    
Pension liability   (3.6)    
Debt   (2.7)    
Other long-term liabilities, including deferred income tax liabilities   (4.8)    
Total purchase price (net of cash acquired of $1.2 million)   35.6    
Cash acquired   $ 1.2