Antidilutive Shares (Details) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0		17.3		0		21.7
Antidilutive Stock Options Excluded Exercise Price Greater Than Average Market Pricengs Per Share, Amount	0	[1]	0	[1]	0	[1]	0.2	[1]
4.75% Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	[2]	0	[2]	0	[2]	4.4	[2]
Preferred Stock Outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	[3]	17.3	[3]	0	[3]	17.3	[3]

[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% Convertible Senior Notes due 2023 (the "4.75% Notes") in March 2013. For purposes of calculating diluted earnings per share, the potentially dilutive shares are pro-rated based on the period they were outstanding but were antidilutive.

[3] We converted all of our 5 1/4% Series B Cumulative Convertible Perpetual Preferred Stock into common stock in October 2013.