Restructuring and Other Charges (Details) ft² in Millions, $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2014 USD ($) right	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) ft² right	Dec. 31, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges					$ (4.1)	$ 208.5	$ 47.5
Restructuring charges					(4.1)
Area subject to Restructuring Activities | ft²						0.4
Area subject to Sublease | ft²						0.1
Duration of sublease						2 years
Renewal Rights | right	1					1
Duration of renewal period						6 months
Deferred rent liability adjustment						$ 9.8
Impairment of intangible assets							0.0
Restructuring reserve	$ 17.0				2.8	17.0
Cost of revenues [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges					(3.5)	41.5	8.4
Restructuring and other charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges					(0.6)	167.0	39.1
Restructuring Plan 2013 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring cost incurred to date	28.9					28.9
Restructuring Plan 2013 [Member] | Cost of revenues [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring cost incurred to date	3.3					3.3
Restructuring Plan 2013 [Member] | Restructuring and other charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring cost incurred to date	25.6					25.6
Asset impairments and write-down [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges					(3.5)	139.2	0.0
Asset impairments and write-down [Member] | Restructuring Plan 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	20.6	$ 2.9	$ 8.9	$ 84.7		12.3
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges					0.4	52.6	22.9
Restructuring charges					0.4
Restructuring reserve	9.4				0.0	9.4
Severance [Member] | Restructuring Plan 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6.9	7.1	9.9	28.0		52.0
Severance [Member] | Restructuring Plan 2013 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring cost incurred to date							0.6
Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges					(1.0)	14.4	10.0
Restructuring charges					(1.0)
Restructuring reserve	7.4				2.8	7.4
Facilities [Member] | Restructuring Plan 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.6	$ 25.0	37.6			14.2
Amount paid to Landlord						12.3
Transaction Fees						5.3
Impairment charges related to licensed software [Member] | Restructuring Plan 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						85.4
Contract termination and other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges					0.0	2.3	$ 14.6
Restructuring charges					(3.5)
Restructuring reserve	$ 0.2				$ 0.0	0.2
Contract termination and other [Member] | Restructuring Plan 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1.5	0.8		2.3
Inventory Write-down [Member] | Restructuring Plan 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			11.5			15.5
Intangible Asset Write-Down [Member] | Restructuring Plan 2014 [Member] | Cost of revenues [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of intangible assets						19.3
Acceleration of Certain End of Life Products [Member] | Restructuring Plan 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 2.3	$ 8.4		$ 6.7