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Acquisition - Narrative (Details) - Altek
£ in Millions, $ in Millions
1 Months Ended 12 Months Ended
May 31, 2018
USD ($)
May 31, 2018
GBP (£)
Dec. 31, 2018
USD ($)
May 31, 2018
GBP (£)
Business Acquisition [Line Items]        
Purchase price $ 60.1 £ 45    
Additional contingent consideration 33.0     £ 25
Estimated preliminary fair value 12.1      
Tax deductible Goodwill (less than) $ 1.0      
Selling, General and Administrative Expenses        
Business Acquisition [Line Items]        
Costs associated with the acquisition     $ 1.0