Stockholders' Equity And Share-Based Awards (Total Fair Value Of Restricted Shares Granted And Vested) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders' Equity And Share-Based Awards [Abstract]
Total fair value of restricted shares granted	$ 36.0	$ 73.9	$ 36.1
Total fair value of restricted shares vested	$ 14.5	$ 19.5	$ 30.0

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Fair Value

No definition available.

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