Restructuring Expenses and Repositioning Expenses - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring and Related Activities [Abstract]
Repositioning expenses	$ 3.3	$ 1.5	$ 2.8	$ 6.6