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Property, Plant and Equipment, net - Narratives (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 158.4 $ 170.8 $ 191.1
Construction in progress $ 55.4 $ 67.9