Segment Data (Schedule Of Revenue Information By Geographic Area) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total revenue	$ 1,006.1	$ 890.5	$ 886.7	$ 884.3	$ 967.4	$ 919.2	$ 918.6	$ 992.5	$ 3,667.6	$ 3,797.6	$ 4,173.0
United States [Member]
Segment Reporting Information [Line Items]
Total revenue									1,576.8	1,695.5	1,755.4
EMEA (Europe, the Middle East & Africa) [Member]
Segment Reporting Information [Line Items]
Total revenue									1,353.5	1,320.3	1,531.6
Other International [Member]
Segment Reporting Information [Line Items]
Total revenue									$ 737.3	$ 781.8	$ 886.0