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Common Stock, Preferred Stock and Equity Plans (Details 2)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
purchase_period
$ / shares
shares
Dec. 31, 2015
period
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
Stock options outstanding and exercisable                  
Exercise price range, options outstanding (in shares) | shares 11,145,000 11,145,000 11,145,000 11,145,000 11,145,000 11,145,000 11,145,000    
Exercise price range, options outstanding, weighted-average remaining contractual life (in years) 7 years 1 month 24 days                
Exercise price range, options outstanding, weighted-average exercise price (usd per share) $ 75.99 $ 75.99 $ 75.99 $ 75.99 $ 75.99 $ 75.99 $ 75.99    
Exercise price range, options exercisable (in shares) | shares 5,541,000 5,541,000 5,541,000 5,541,000 5,541,000 5,541,000 5,541,000    
Restricted stock and Restricted Stock Units, weighted-average grant-date fair value                  
Weighted-average grant-date fair value, restricted stock units vested and expected to vest (usd per share) $ 56.85 $ 56.85 $ 56.85 $ 56.85 $ 56.85 $ 56.85 $ 56.85    
$18.93–$20.00                  
Stock options outstanding and exercisable                  
Exercise price, low end of range (usd per share)     18.93            
Exercise price, high end of range (usd per share)     $ 20.00            
Exercise price range, options outstanding (in shares) | shares 138,000 138,000 138,000 138,000 138,000 138,000 138,000    
Exercise price range, options outstanding, weighted-average remaining contractual life (in years) 2 years 1 month 6 days                
Exercise price range, options outstanding, weighted-average exercise price (usd per share) $ 18.93 $ 18.93 $ 18.93 $ 18.93 $ 18.93 $ 18.93 $ 18.93    
Exercise price range, options exercisable (in shares) | shares 138,000 138,000 138,000 138,000 138,000 138,000 138,000    
Restricted stock and Restricted Stock Units, weighted-average grant-date fair value                  
Weighted-average grant-date fair value, restricted stock units vested and expected to vest (usd per share) $ 18.93 $ 18.93 $ 18.93 $ 18.93 $ 18.93 $ 18.93 $ 18.93    
$20.01–$40.00                  
Stock options outstanding and exercisable                  
Exercise price, low end of range (usd per share)     20.01            
Exercise price, high end of range (usd per share)     $ 40            
Exercise price range, options outstanding (in shares) | shares 2,247,000 2,247,000 2,247,000 2,247,000 2,247,000 2,247,000 2,247,000    
Exercise price range, options outstanding, weighted-average remaining contractual life (in years) 3 years 8 months 12 days                
Exercise price range, options outstanding, weighted-average exercise price (usd per share) $ 34.38 $ 34.38 $ 34.38 $ 34.38 $ 34.38 $ 34.38 $ 34.38    
Exercise price range, options exercisable (in shares) | shares 2,155,000 2,155,000 2,155,000 2,155,000 2,155,000 2,155,000 2,155,000    
Restricted stock and Restricted Stock Units, weighted-average grant-date fair value                  
Weighted-average grant-date fair value, restricted stock units vested and expected to vest (usd per share) $ 34.24 $ 34.24 $ 34.24 $ 34.24 $ 34.24 $ 34.24 $ 34.24    
$40.01–$60.00                  
Stock options outstanding and exercisable                  
Exercise price, low end of range (usd per share)     40.01            
Exercise price, high end of range (usd per share)     $ 60            
Exercise price range, options outstanding (in shares) | shares 2,310,000 2,310,000 2,310,000 2,310,000 2,310,000 2,310,000 2,310,000    
Exercise price range, options outstanding, weighted-average remaining contractual life (in years) 6 years 7 months 10 days                
Exercise price range, options outstanding, weighted-average exercise price (usd per share) $ 48.09 $ 48.09 $ 48.09 $ 48.09 $ 48.09 $ 48.09 $ 48.09    
Exercise price range, options exercisable (in shares) | shares 1,444,000 1,444,000 1,444,000 1,444,000 1,444,000 1,444,000 1,444,000    
Restricted stock and Restricted Stock Units, weighted-average grant-date fair value                  
Weighted-average grant-date fair value, restricted stock units vested and expected to vest (usd per share) $ 49.03 $ 49.03 $ 49.03 $ 49.03 $ 49.03 $ 49.03 $ 49.03    
$60.01–$80.00                  
Stock options outstanding and exercisable                  
Exercise price, low end of range (usd per share)     60.01            
Exercise price, high end of range (usd per share)     $ 80            
Exercise price range, options outstanding (in shares) | shares 1,434,000 1,434,000 1,434,000 1,434,000 1,434,000 1,434,000 1,434,000    
Exercise price range, options outstanding, weighted-average remaining contractual life (in years) 8 years 1 month 2 days                
Exercise price range, options outstanding, weighted-average exercise price (usd per share) $ 75.96 $ 75.96 $ 75.96 $ 75.96 $ 75.96 $ 75.96 $ 75.96    
Exercise price range, options exercisable (in shares) | shares 557,000 557,000 557,000 557,000 557,000 557,000 557,000    
Restricted stock and Restricted Stock Units, weighted-average grant-date fair value                  
Weighted-average grant-date fair value, restricted stock units vested and expected to vest (usd per share) $ 75.15 $ 75.15 $ 75.15 $ 75.15 $ 75.15 $ 75.15 $ 75.15    
$80.01–$100.00                  
Stock options outstanding and exercisable                  
Exercise price, low end of range (usd per share)     80.01            
Exercise price, high end of range (usd per share)     $ 100            
Exercise price range, options outstanding (in shares) | shares 1,785,000 1,785,000 1,785,000 1,785,000 1,785,000 1,785,000 1,785,000    
Exercise price range, options outstanding, weighted-average remaining contractual life (in years) 7 years 11 months 27 days                
Exercise price range, options outstanding, weighted-average exercise price (usd per share) $ 90.28 $ 90.28 $ 90.28 $ 90.28 $ 90.28 $ 90.28 $ 90.28    
Exercise price range, options exercisable (in shares) | shares 702,000 702,000 702,000 702,000 702,000 702,000 702,000    
Restricted stock and Restricted Stock Units, weighted-average grant-date fair value                  
Weighted-average grant-date fair value, restricted stock units vested and expected to vest (usd per share) $ 87.55 $ 87.55 $ 87.55 $ 87.55 $ 87.55 $ 87.55 $ 87.55    
$100.01–$120.00                  
Stock options outstanding and exercisable                  
Exercise price, low end of range (usd per share)     100.01            
Exercise price, high end of range (usd per share)     $ 120.00            
Exercise price range, options outstanding (in shares) | shares 1,727,000 1,727,000 1,727,000 1,727,000 1,727,000 1,727,000 1,727,000    
Exercise price range, options outstanding, weighted-average remaining contractual life (in years) 9 years 18 days                
Exercise price range, options outstanding, weighted-average exercise price (usd per share) $ 109.31 $ 109.31 $ 109.31 $ 109.31 $ 109.31 $ 109.31 $ 109.31    
Exercise price range, options exercisable (in shares) | shares 294,000 294,000 294,000 294,000 294,000 294,000 294,000    
Restricted stock and Restricted Stock Units, weighted-average grant-date fair value                  
Weighted-average grant-date fair value, restricted stock units vested and expected to vest (usd per share) $ 109.23 $ 109.23 $ 109.23 $ 109.23 $ 109.23 $ 109.23 $ 109.23    
$120.01–$134.69                  
Stock options outstanding and exercisable                  
Exercise price, low end of range (usd per share)     120.01            
Exercise price, high end of range (usd per share)     $ 134.69            
Exercise price range, options outstanding (in shares) | shares 1,504,000 1,504,000 1,504,000 1,504,000 1,504,000 1,504,000 1,504,000    
Exercise price range, options outstanding, weighted-average remaining contractual life (in years) 9 years 6 months 11 days                
Exercise price range, options outstanding, weighted-average exercise price (usd per share) $ 131.04 $ 131.04 $ 131.04 $ 131.04 $ 131.04 $ 131.04 $ 131.04    
Exercise price range, options exercisable (in shares) | shares 251,000 251,000 251,000 251,000 251,000 251,000 251,000    
Restricted stock and Restricted Stock Units, weighted-average grant-date fair value                  
Weighted-average grant-date fair value, restricted stock units vested and expected to vest (usd per share) $ 128.90 $ 128.90 $ 128.90 $ 128.90 $ 128.90 $ 128.90 $ 128.90    
Employee Stock Purchase Plan                  
Employee Stock Purchase Plan                  
Offering period (in months) 12 months                
Number of purchase periods           2 2    
Duration of purchase period 6 months                
Eligible employee purchase price percentage of fair value       85.00%          
Number of shares authorized (shares) | shares 1,163,614 1,163,614 1,163,614 1,163,614 1,163,614 1,163,614 1,163,614    
Number of shares (shares) | shares   233,000              
Average price paid per share (usd per share) $ 84.50 $ 84.50 $ 84.50 $ 84.50 $ 84.50 $ 84.50 $ 84.50    
Restricted Stock                  
Restricted stock and Restricted Stock Units                  
Beginning of the period (in shares) | shares   2,907,000              
Granted (in shares) | shares   1,407,000              
Vested (in shares) | shares   (1,033,000)              
Cancelled (in shares) | shares   (450,000)              
End of the period (in shares) | shares   2,831,000           2,907,000  
Restricted stock and Restricted Stock Units, weighted-average grant-date fair value                  
Weighted-average grant-date fair value, as of the beginning of the period (usd per share)     78.18            
Weighted-average grant-date fair value, granted (usd per share)     116.63            
Weighted-average grant-date fair value, vested (usd per share)     68.39            
Weighted-average grant-date fair value, cancelled (usd per share)     91.21            
Weighted-average grant-date fair value, as of the end of the period (usd per share)     98.80         $ 78.18  
Restricted stock vested in period, total fair value | $         $ 124.0     $ 54.5 $ 50.9
Restricted Stock Units                  
Restricted stock and Restricted Stock Units                  
Beginning of the period (in shares) | shares   185,000              
Granted (in shares) | shares   97,000              
Vested (in shares) | shares   (66,000)              
Cancelled (in shares) | shares   (23,000)              
End of the period (in shares) | shares   193,000           185,000  
Restricted stock and Restricted Stock Units, weighted-average grant-date fair value                  
Weighted-average grant-date fair value, as of the beginning of the period (usd per share)     76.79            
Weighted-average grant-date fair value, granted (usd per share)     118.26            
Weighted-average grant-date fair value, vested (usd per share)     70.24            
Weighted-average grant-date fair value, cancelled (usd per share)     89.97            
Weighted-average grant-date fair value, as of the end of the period (usd per share)     $ 98.36         $ 76.79  
Restricted stock vested in period, total fair value | $         $ 8.0     $ 2.9 $ 1.7