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Property, Plant and Equipment (Detail Textuals) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment      
Depreciation expense $ 166.2 $ 166.9 $ 220.6
Accounts payable for purchases of property and equipment $ 14.8 $ 7.1 $ 3.4