Restructuring and Other Charges (Benefits) - Included in Cost of Revenues and Restructuring and Other Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges (benefits)	$ 3.3	$ (4.1)	$ 208.5
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges (benefits)	0.0	(3.5)	41.5
Operating expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges (benefits)	3.3	(0.6)	167.0
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges (benefits)	2.8	0.4	52.6
Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges (benefits)	0.5	(1.0)	14.4
Contract termination and other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges (benefits)	0.0	0.0	2.3
Asset impairments and write-down [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges (benefits)	$ 0.0	$ (3.5)	$ 139.2