Segment Information (Consolidated Revenue Information By Geographic Area) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 646.8	$ 577.1
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	344.0	301.4
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	302.8	275.7
International [Member] | EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	195.4	183.3
International [Member] | Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 107.4	$ 92.4