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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]          
inventory step-up and backlog amortization $ 1.9   $ 8.5    
Business Combination, Integration Related Costs $ 4.1 $ 2.6 9.2 $ 2.6  
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