Restructuring Activities - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 47.8	$ 12.1	$ 2.5
Restructuring expected accrual to pay	33.5
Restructuring expected accrual remaining to pay	$ 4.0