Segments, Geographical (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Net Revenues by Geographic Region [Line Items]
Total net revenues	$ 1,067.4	$ 1,170.1
Property and equipment, net and purchased intangible assets, net	962.7		966.7
United States [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	533.5	623.7
Property and equipment, net and purchased intangible assets, net	871.0		871.7
Other [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	55.5	57.8
Americas [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	589.0	681.5
EMEA [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	303.8	295.7
Asia Pacific [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	174.6	192.9
International [Member]
Net Revenues by Geographic Region [Line Items]
Property and equipment, net and purchased intangible assets, net	$ 91.7		$ 95.0