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Stock-Based Compensation (Stock Options) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 02, 2013
Sep. 03, 2013
Jun. 03, 2013
Mar. 01, 2013
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 (1,100,000) (1,700,000) (4,400,000)        
Exercised, Weighted-Average Exercise Price $ 20.31 $ 19.33 $ 17.74        
Stock Options [Member]
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Exercise price of options to purchase common stock granted       $ 48.80 $ 47.25 $ 46.22 $ 43.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]              
Options outstanding, Shares, beginning balance 6,200,000            
Options outstanding, Weighted-Average Exercise Price, beginning balance $ 24.29            
Granted, Shares 1,000,000 [1]            
Granted, Weighted-Average Exercise Price $ 46.43 [1]            
Exercised, Shares (1,100,000)            
Exercised, Weighted-Average Exercise Price $ 20.31            
Forfeited, Shares (100,000)            
Forfeited, Weighted-Average Exercise Price $ 35.40            
Expired, Shares 0            
Expired, Weighted-Average Exercise Price $ 0.00            
Options outstanding, Shares, ending balance 6,000,000 6,200,000          
Options outstanding, Weighted-Average Exercise Price, ending balance $ 28.48 $ 24.29          
Options outstanding, Weighted-Average Remaining Contractual Term (Years) 6 years 6 months 29 days            
Options outstanding, Aggregate Intrinsic Value $ 127.4            
Options exercisable, Shares 3,500,000            
Options exercisable, Weighted-Average Exercise Price $ 21.23            
Options exercisable, Weighted-Average Remaining Contractual Term (Years) 5 years 5 months 23 days            
Options exercisable, Aggregate Intrinsic Value 100.7            
Options exercisable and expected to vest thereafter, Shares 6,000,000            
Options exercisable and expected to vest thereafter, Weighted-Average Exercise Price $ 28.35            
Options exercisable and expected to vest thereafter, Weighted-Average Remaining Contractual Term (Years) 6 years 6 months 22 days            
Options exercisable and expected to vest thereafter, Aggregate Intrinsic Value 127.1            
Options available for future grants, Shares 6,000,000            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]              
Weighted average grant-date fair value of stock options granted $ 17.93 $ 15.25 $ 15.69        
Total intrinsic value of stock options exercised $ 31.3 $ 36.2 $ 81.0        
Stock Options [Member] | Director [Member]
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Automatic grant of options to purchase common stock (per non-employee director)       5,000 5,000 5,000 5,000
Expiration period (in years) 10 years            
Vesting increments (percentage) 25.00%            
Vesting period (in years) 4 years            
Stock Options [Member] | Employee [Member]
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expiration period (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 0.58% 0.49% 0.62%        
Expected term 4 years 4 years 4 years        
Expected volatility rate 29.00% 39.00% 39.00%        
Maximum [Member]
             
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]              
Risk-free interest rate 2.24% 1.40% 2.81%        
Expected term 7 years 7 years 7 years        
Expected volatility rate 44.00% 48.00% 50.00%        
2008 Equity and Incentive Plan | Employee [Member]
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized 12,000,000            
Annual Employee Grant, 2013 [Member] | Stock Options [Member] | Employee [Member]
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized 800,000            
Percentage of total stock option award granted on specific date       25.00% 25.00% 25.00% 25.00%
2007 Non-Employee Director Plan [Member] | Director [Member]
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized 2,000,000            
[1] The options granted during 2013, are related to our employee and non-employee director quarterly stock option award grants in March, June, September, and December 2013.