Acquisitions Acquisition (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended					9 Months Ended
	Aug. 02, 2012	Jun. 07, 2012	Jun. 07, 2012 Vela Systems [Member]	Aug. 02, 2012 Socialcam [Member]	Oct. 04, 2012 Qontext [Member]	Oct. 31, 2012 Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price			$ 76.0	$ 59.5	$ 26.0	$ 52.2
Business Combination, Fair Value of original equity investment			6.8
Business Acquisition, Preexisting Relationship, Gain (Loss) Recognized		3.3
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount		0		0	24.0
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost	$ 16.6
Business acquisition, number of acquisitions						5