Restructuring - Restructuring Reserve Activity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring and Related Activities [Abstract]
Document Period End Date			Sep. 30, 2018
Balance at January 1			$ 54.0	$ 89.9
Liabilities incurred	$ 38.3	$ 17.4	44.4	44.7
Restructuring Liabilities	0.0	(8.2)	0.0	(8.2)
Liabilities paid/settled			(37.9)	(57.8)
Balance at June 30	$ 60.5	$ 68.6	$ 60.5	$ 68.6