Property, Plant & Equipment - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 7.2	$ 4.5	$ 14.0	$ 8.7
Cost of Sales, depreciation	$ 3.8	$ 2.8	$ 7.6	$ 5.4