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Stock-Based Compensation (Stock Options) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected dividend rate 0.00% 0.00% 0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Exercised, Shares (1.7) (4.4) (3.1)
Exercised, Weighted-Average Exercise Price $ 19.33 $ 17.74 $ 16.25
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options outstanding, Shares, beginning balance 6.8    
Options outstanding, Weighted-Average Exercise Price, beginning balance $ 21.03    
Granted, Shares 1.1 [1]    
Granted, Weighted-Average Exercise Price $ 37.22 [1]    
Exercised, Shares (1.7)    
Exercised, Weighted-Average Exercise Price $ 19.33    
Forfeited, Shares 0    
Forfeited, Weighted-Average Exercise Price $ 0.00    
Expired, Shares 0    
Expired, Weighted-Average Exercise Price $ 0.00    
Options outstanding, Shares, ending balance 6.2 6.8  
Options outstanding, Weighted-Average Exercise Price, ending balance $ 24.29 $ 21.03  
Options outstanding, Weighted-Average Remaining Contractual Term (Years) 6 years 7 months 21 days    
Options outstanding, Aggregate Intrinsic Value $ 96.2    
Options exercisable, Shares 3.6    
Options exercisable, Weighted-Average Exercise Price $ 19.18    
Options exercisable, Weighted-Average Remaining Contractual Term (Years) 5 years 6 months 15 days    
Options exercisable, Aggregate Intrinsic Value 74.1    
Options exercisable and expected to vest thereafter, Shares 6.2    
Options exercisable and expected to vest thereafter, Weighted-Average Exercise Price $ 24.19    
Options exercisable and expected to vest thereafter, Weighted-Average Remaining Contractual Term (Years) 6 years 7 months 10 days    
Options exercisable and expected to vest thereafter, Aggregate Intrinsic Value 96.1    
Options available for future grants, Shares 6.9    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted average grant-date fair value of stock options granted $ 15.25 $ 15.69 $ 9.57
Total intrinsic value of stock options exercised $ 36.2 $ 81.0 $ 24.8
Stock Options [Member] | Director [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period of employee stock options (in years) 10 years    
Stock Options [Member] | Non Employee Awards Granted in Years Subsequent to 2011 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting increments (percentage) 25.00%    
Vesting period (in years) 4 years    
Stock Options [Member] | Non Employee Awards Granted in Years Prior to and Including 2011 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period of employee stock options (in years) 10 years    
Stock Options [Member] | Employee Awards Granted in Years Prior to and Including 2008 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period of employee stock options (in years) 10 years    
Vesting increments (percentage) 25.00%    
Vesting period (in years) 4 years    
Stock Options [Member] | Employee Awards Granted in Years Subsequent to 2008 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period of employee stock options (in years) 10 years    
Vesting increments (percentage) 25.00%    
Vesting period (in years) 4 years    
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate 0.49% 0.62% 1.18%
Expected term 4 years 4 years 4 years
Expected volatility rate 39.00% 39.00% 40.00%
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate 1.40% 2.81% 3.24%
Expected term 7 years 7 years 7 years
Expected volatility rate 48.00% 50.00% 49.00%
[1] The options granted during 2012, are primarily related to our employee and non-employee director quarterly stock option award grants in March, June, September, and December 2012.