Restructuring - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 6.2	$ 11.7
Closure of Manitowoc, WI Facility
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 11.7