Restructuring Expenses and Repositioning Expenses - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Repositioning expenses	$ 6.0		$ 4.0	$ 28.4	$ 6.9
Asset Write Off [Member]
Restructuring Cost and Reserve [Line Items]
Repositioning expenses		$ 8.5
Productivity Program [Member]
Restructuring Cost and Reserve [Line Items]
Repositioning expenses	$ 3.6			$ 11.7