Segment Information (Consolidated Revenue Information By Geographic Area) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 531.3	$ 513.3	$ 1,713.6	$ 1,467.7
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	274.3	278.3	890.7	794.4
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	257.0	235.0	822.9	673.3
International [Member] | EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	163.1	155.5	532.1	453.9
International [Member] | Other Regions [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 93.9	$ 79.5	$ 290.8	$ 219.4