Restructuring - Restructuring Reserve Activity (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 8.9
Charged to Earnings	2.3
Payments Made	(7.3)
Ending Balance	3.2
Release of liability	(0.7)
Severance and related expense
Restructuring Reserve [Roll Forward]
Beginning Balance	8.3
Payments Made	(4.9)
Ending Balance	3.2
Release of liability	(0.7)
Asset Write Offs
Restructuring Reserve [Roll Forward]
Charged to Earnings	0.5
Other
Restructuring Reserve [Roll Forward]
Beginning Balance	0.6
Charged to Earnings	1.8
Payments Made	(2.4)
Ending Balance	0.0
Release of liability	$ 0.0