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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Business Acquisition [Line Items]      
inventory step-up and backlog amortization $ 6.6    
Business Combination, Integration Related Costs 5.2 $ 0.0  
Goodwill, Acquired During Period 231.0   $ 31.5
Westlock [Member]      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross 40.0    
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period 32.0    
Goodwill, Acquired During Period 0.0   22.6
Microtronic [Member]      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross $ 18.0    
Goodwill, Acquired During Period     $ 8.9