Antidilutive Shares (Details) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Antidilutive Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0		0		23.7		33.4
Antidilutive Stock Options Excluded Exercise Price Greater Than Average Market Price	0.2	[1]	7.1	[1]	1.3	[1]	7.1	[1]
4.75% Notes
Antidilutive Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	[2]	0		6.6	[2]	16.7
Preferred stock outstanding
Antidilutive Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0		0		17.1		16.7

[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.

[2] We retired all of our outstanding 4.75% Notes in March 2013. See Note 2 for further information on our 4.75% Notes. For purposes of calculating diluted earnings per share, the potentially dilutive shares are pro-rated based on the period they were outstanding.