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Property, Plant and Equipment, net - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]          
Depreciation expense $ 12.9 $ 11.1 $ 25.3 $ 22.3  
Depreciation expense with cost of revenue 2.3 $ 1.7 4.5 $ 3.3  
Property, plant and equipment, net 416.4   416.4   $ 376.3
Assets Held Under Finance Leases          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, net $ 38.7   $ 38.7    
Net book value, prior year         $ 40.0