Antidulitive Shares (Details) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Stock Options Excluded Exercise Price Greater Than Average Market Price	7.1	[1]	7.7	[1]	7.1	[1]	7.7	[1]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0		0		33.4		32.5
4.75% Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0		0		16.7		16.3
Preferred Stock Outstanding [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0		0		16.7		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.