Antidilutive Shares (Details) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Antidilutive Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0		16.2		16.5		32.3
Antidilutive Stock Options, Exercise Price Greater Than Average Market Price	12.6	[1]	16.6	[1]	9.1	[1]	19.5	[1]
4.75% Notes
Antidilutive Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0		0		0		16.1
Preferred stock outstanding
Antidilutive Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0		16.2		16.5		16.2

[1] These options are outstanding at the end of the respective periods. In any period in which the exercise price is less than the average market price, these options have the potential to be dilutive, and application of the treasury stock method would reduce this amount.