Property, Plant, and Equipment - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Depreciation [Abstract]
Depreciation expense	$ 94.6	$ 82.4
Incremental depreciation	8.3
Purchases of property, plant, and equipment included in accounts payable	$ 55.2		$ 29.8