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Property, Plant and Equipment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Other Income (Expense) – Net      
Property, Plant and Equipment      
Gain on assets held for sale $ 3.5 $ 3.5  
Other Current Assets      
Property, Plant and Equipment      
Assets held for sale     $ 12.9