Restructuring - Restructuring Reserve Activity (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]
Document Period End Date			Jun. 30, 2017
Balance at January 1			$ 89.9	$ 4.7
Liabilities incurred	$ 14.4	$ 5.0	27.3	5.4
Liabilities paid/settled			(37.7)	(4.8)
Balance at June 30	$ 79.5	$ 5.3	$ 79.5	$ 5.3