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Acquisitions (Details)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 01, 2017
USD ($)
Mar. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
item
Acquisitions      
Total purchase price   $ 10.6 $ 9.4
Number of acquisitions | item   2 4
Notes to former owners      
Acquisitions      
Number of acquisitions | item   3  
BCH      
Acquisitions      
Total purchase price $ 121.3    
Amount allocated to goodwill and identifiable intangible assets for acquisitions   $ 97.0  
Purchase price paid in cash 95.4    
Promissory note payable 14.3    
Contingent earn-out obligation $ 11.6