Acquisitions And Discontinued Operations (Pro Forma Results) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Acquisitions And Discontinued Operations [Abstract]
Revenue	$ 4,359.2		$ 4,122.8		$ 3,873.3
Net income (loss)	$ (14.1)		$ 158.6		$ 219.2
Net income (loss) per share - basic	$ (0.32)		$ 3.48		$ 4.33
Net income (loss) per share - diluted	$ (0.32)	[1]	$ 3.43	[1]	$ 4.29	[1]
Weighted average shares outstanding - basic	45.2		45.6		50.6
Weighted average shares outstanding - diluted	45.2	[1]	46.3	[1]	51.1	[1]

[1] Weighted average shares outstanding and per diluted share amounts in 2011 exclude common stock equivalents, since the impact of these instruments would be antidilutive.