Employee Stock Benefit Plans (Summary Of Stock Option Plans) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]
Number of Shares, Outstanding at December 31, 2010	27.4
Weighted-Average Exercise Price, Outstanding at December 31, 2010	$ 7.44
Number of Shares, Granted	0.3
Weighted-Average Exercise Price, Granted	$ 10.17
Number of Shares, Exercised	(8.5)
Weighted-Average Exercise Price, Exercised	$ 6.85
Number of Shares, Cancellations	(0.7)
Weighted-Average Exercise Price, Cancellations	$ 9.14
Number of Shares, Outstanding at September 30, 2011	18.5
Weighted-Average Exercise Price, Outstanding at September 30, 2011	$ 7.69
Weighted-Average Remaining Contractual Term (in years), Outstanding at September 30, 2011	4.7
Aggregate Intrinsic Value (In-The-Money), Outstanding at September 30, 2011	$ 14.3
Number of Shares, Exercisable at September 30, 2011	14.7
Weighted-Average Exercise Price, Exercisable at September 30, 2011	$ 7.82
Weighted-Average Remaining Contractual Term (in years), Exercisable at September 30, 2011	4.2
Aggregate Intrinsic Value (In-The-Money), Exercisable at September 30, 2011	$ 11.6