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Acquisition - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 09, 2017
Aug. 31, 2016
Dec. 31, 2016
Cambridge      
Business Acquisition [Line Items]      
Aggregate purchase price $ 584.1    
Cash acquired from acquisition 132.3    
Note payable incurred $ 23.9    
STP      
Business Acquisition [Line Items]      
Aggregate purchase price   $ 1,230.0  
Cash acquired from acquisition   40.2  
Contingent liabilities   15.1  
Indemnification assets   15.1  
Other      
Business Acquisition [Line Items]      
Aggregate purchase price     $ 76.7
Cash acquired from acquisition     $ 11.1
Non-compete agreements | STP      
Business Acquisition [Line Items]      
Customer relationships and other identifiable intangible assets   $ 23.2