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Stock-based Compensation Plans (Stock-based Compensation) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Exercisable at period end, shares 6,200,000   7,300,000
Weighted-average grant date fair value $ 8.47 $ 6.87  
Weighted-average risk-free interest rates 1.09% 1.15%  
Dividend yield 0.00% 0.00%  
Expected term 6 years 3 months 6 years 6 months  
Weighted-average volatility 48.60% 55.50%  
Compensation expense $ 4.4 $ 0.7  
Stock options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at December 31, 2012 (shares) 12,379,000    
Granted (shares) 1,282,000    
Exercised (shares) (1,212,000)    
Forfeited or expired (shares) (243,000)    
Outstanding at March 31, 2013 (shares) 12,206,000    
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding at December 31, 2012 (per share) 299,000    
Granted (shares) 219,000    
Vested (shares) (3,000)    
Forfeited or expired (shares) (10,000)    
Outstanding at March 31, 2013 (per share) 505,000    
Performance-Based Share Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, award vesting period 4 years    
Share-based compensation arrangement by share-based payment award vesting percentage 25.00%    
Share-based compensation arrangement by share-based payment award number of stock units that would be issued on vesting of shares 1    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding at December 31, 2012 (per share) 0 [1]    
Granted (shares) 52,000 [1]    
Vested (shares) 0 [1]    
Forfeited or expired (shares) (4,000) [1]    
Outstanding at March 31, 2013 (per share) 48,000 [1]    
Minimum [Member] | Performance-Based Share Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award vesting percentage 0.00%    
Maximum [Member] | Performance-Based Share Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award vesting percentage 200.00%    
[1] Share unit amounts represent the target number of PSUs considered granted for accounting recognition based on the establishment of performance targets for future years. The actual number of shares that will be earned upon vesting is dependent upon actual performance and may range from zero to 200% of the target number of shares.