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Share-Based Compensation and Employee Ownership Plans Restricted Shares and Restricted Stock Units (Details) (Equity Plans, Restricted Shares and Restricted Stock Units (RSUs), USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Equity Plans | Restricted Shares and Restricted Stock Units (RSUs)
   
Nonvested Restricted Shares and Restricted Stock Units    
Balance outstanding, beginning of period, shares 10,252,023 7,517,682
Granted, shares 5,866,349 8,381,939
Vested, shares (1,036,040) (4,855,489)
Cancelled, shares 0 0
Forfeited, shares (75,535) (792,109)
Balance outstanding, end of period, shares 15,006,797  
Weighted-Average Grant Date Fair Value    
Balance outstanding, beginning of period, in dollars per share $ 4.15 $ 5.57
Granted, in dollars per share $ 2.50 $ 2.82
Vested, in dollars per share $ 2.87 $ 4.16
Cancelled, in dollars per share $ 0.00 $ 0.00
Forfeited, in dollars per share $ 3.40 $ 3.51
Balance outstanding, end of period, in dollars per share $ 3.60  
Unrecognized compensation expense $ 34.0  
Weighted-average recognition period for unrecognized compensation expense 1 year 10 months 24 days