Segments, Geographical (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Net Revenues by Geographic Region [Line Items]
Total net revenues	$ 1,097.9	$ 1,067.4
Property and equipment, net and purchased intangible assets, net	1,077.9		$ 1,054.9
United States [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	579.0	533.5
Property and equipment, net and purchased intangible assets, net	946.2		925.5
Other [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	49.2	55.5
Americas [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	628.2	589.0
EMEA [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	285.4	303.8
Asia Pacific [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	184.3	$ 174.6
International [Member]
Net Revenues by Geographic Region [Line Items]
Property and equipment, net and purchased intangible assets, net	$ 131.7		$ 129.4