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Antidilutive Shares (Details)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Antidilutive Securities Excluded from the Earnings Per Share Calculation [Abstract]    
Restricted stock, stock options and other equity awards 6.8 5.7
4.75% Notes 0 [1] 13.4 [1]
Preferred stock 0 [2] 17.1 [2]
Total Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 6.8 36.2
Securities excluded from the diluted loss per share calculation because the exercise price was greater than the average market price: [Abstract]    
Stock options 0 [3] 3.2 [3]
[1] 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 loss per share, the potentially dilutive shares are pro-rated based on the period they were outstanding but were antidilutive.
[2] We converted all of our Series B Preferred Stock into common stock in October 2013.
[3] 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.