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Property, Plant, and Equipment - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Depreciation [Abstract]          
Depreciation expense $ 89.0 $ 87.0 $ 275.3 $ 253.0  
Incremental depreciation     14.0    
Purchases of property, plant, and equipment included in accounts payable     $ 46.2   $ 29.8