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Net Property, Plant and Equipment - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]      
Depreciation $ 183.4 $ 176.6 $ 176.8
Interest Costs Capitalized $ 4.0 $ 3.7 $ 4.3