Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance	$ 1.2
Charges	19.4	$ 0.0
Cash Payments	(5.2)
Other	0.6
Restructuring liability, ending balance	16.0
Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance	0.7
Charges	18.8
Cash Payments	(5.2)
Other	0.6
Restructuring liability, ending balance	14.9
Severance [Member] | 2017 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Charges	18.8
Contract terminations and other [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance	0.5
Charges	0.6
Cash Payments	0.0
Other	0.0
Restructuring liability, ending balance	1.1
Contract terminations and other [Member] | 2017 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Charges	$ 0.6