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Stock-Based Compensation (Stock Options) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 01, 2015
Sep. 01, 2015
Jun. 01, 2015
Mar. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]              
Expected dividend rate (percentage) 0.00% 0.00% 0.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]              
Exercised, shares (1.3) (1.7) (1.1)        
Exercised, weighted-average exercise price (in dollars per share) $ 23.33 $ 20.50 $ 20.31        
Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Exercise price of options to purchase common stock granted       $ 64.48 $ 58.08 $ 62.93 $ 62.60
Expiration period (in years) 10 years            
Vesting increments (percentage) 25.00%            
Vesting period (in years) 4 years            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]              
Options outstanding, beginning balance (in shares) 5.0            
Options outstanding, weighted-average exercise price, beginning balance (in dollars per share) $ 36.43            
Granted, shares [1] 1.0            
Granted, weighted-average exercise price (in dollars per share) [1] $ 62.06            
Exercised, shares (1.3)            
Exercised, weighted-average exercise price (in dollars per share) $ 23.33            
Forfeited, shares (0.1)            
Forfeited, weighted-average exercise price (in dollars per share) $ 51.50            
Expired, shares 0.0            
Expired, weighted-average exercise price (in dollars per share) $ 0.00            
Options outstanding, beginning balance (in shares) 4.6 5.0          
Options outstanding, weighted-average exercise price, ending balance (in dollars per share) $ 45.07 $ 36.43          
Options outstanding, weighted-average remaining contractual term (years) 6 years 9 months 50 days            
Options outstanding, aggregate intrinsic value $ 70.1            
Options exercisable (in shares) 2.3            
Options exercisable, weighted-average exercise price (in dollars per share) $ 35.09            
Options exercisable, weighted-average remaining contractual term (years) 5 years 6 months 17 days            
Options exercisable, aggregate intrinsic value $ 57.1            
Options exercisable and expected to vest thereafter (in shares) 4.6            
Options exercisable and expected to vest thereafter, weighted-average exercise price (in dollars per share) $ 44.76            
Options exercisable and expected to vest thereafter, weighted-average remaining contractual term (years) 6 years 9 months 18 days            
Options exercisable and expected to vest thereafter, aggregate intrinsic value $ 70.4            
Options available for future grants (in shares) 4.3            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]              
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 19.38 $ 20.56 $ 17.93        
Total intrinsic value of stock options exercised $ 51.9 $ 56.2 $ 31.3        
Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]              
Risk-free interest rate (percentage) 0.76% 1.11% 0.58%        
Expected term (in years) 2 years 4 years 4 years        
Expected volatility rate (percentage) 24.00% 25.00% 29.00%        
Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]              
Risk-free interest rate (percentage) 1.86% 2.04% 2.24%        
Expected term (in years) 7 years 7 years 7 years        
Expected volatility rate (percentage) 34.00% 36.00% 44.00%        
[1] The options granted during 2015, are primarily related to our employee quarterly stock option award grants in March, June, September, and December 2015.