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Business Combinations - Hudson Narratives (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 20, 2017
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition      
Payment for acquisition of businesses, net of cash acquired   $ 12.5 $ 23.2
Borrowings on revolving credit facilities   38.0 2.2
Sales   279.7 204.1
Operating income   16.9 0.3
Amortization expense   6.1 $ 3.0
Hudson      
Business Acquisition      
Payment for acquisition of businesses, net of cash acquired $ 419.5    
Borrowings on revolving credit facilities $ 300.0    
Sales   43.3  
Operating income   4.2  
Amortization expense   $ 3.0  
Hudson | Minimum      
Business Acquisition      
Finite lived intangible assets useful life 2 years    
Hudson | Maximum      
Business Acquisition      
Finite lived intangible assets useful life 15 years