Property, Plant, and Equipment - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Depreciation [Abstract]
Depreciation expense	$ 85.8	$ 91.6	$ 171.0	$ 186.2
Incremental depreciation			0.2	$ 13.5
Purchases of property, plant, and equipment included in accounts payable			$ 27.0		$ 24.7