Stock Options (Summary Of Stock Option Activity) (Details) (Stock Options [Member], USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at December 31, 2011, Shares	2,707
Granted, Shares	655
Exercised, Shares	(27)
Forfeited and expired, Shares	(468)
Outstanding at March 31, 2012, Shares	2,867
Expected to vest at March 31, 2012, Shares	1,168
Exercisable at March 31, 2012, Shares	1,635
Outstanding at December 31, 2011, Weighted-Average Exercise Price	$ 56.81
Granted, Weighted-Average Exercise Price	$ 19.52
Exercised, Weighted-Average Exercise Price	$ 5.48
Forfeited and expired, Weighted-Average Exercise Price	$ 133.44
Outstanding at March 31, 2012, Weighted-Average Exercise Price	$ 35.99
Expected to vest at March 31, 2012, Weighted-Average Exercise Price	$ 27.88
Exercisable at March 31, 2012, Weighted-Average Exercise Price	$ 42.24
Outstanding at March 31, 2012, Weighted-Average Remaining Contractual Term (years)	3.05
Expected to vest at March 31, 2012, Weighted-Average Remaining Contractual Term (years)	4.24
Exercisable at March 31, 2012, Weighted-Average Remaining Contractual Term (years)	2.15
Outstanding at March 31, 2012, Aggregate Intrinsic Value	$ 8.0
Expected to vest at March 31, 2012, Aggregate Intrinsic Value	0.1
Exercisable at March 31, 2012, Aggregate Intrinsic Value	$ 7.9