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Debt (Narrative) (Details)
3 Months Ended 12 Months Ended
Apr. 15, 2019
USD ($)
shares
Nov. 15, 2017
USD ($)
Jan. 07, 2015
USD ($)
Apr. 30, 2014
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Mar. 31, 2018
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Oct. 15, 2018
USD ($)
Feb. 01, 2017
$ / shares
Debt Instrument [Line Items]                      
Temporary equity from convertible notes         $ 1,163,000 $ 8,110,000          
Conversion notices received, amount                   $ 273,000,000  
Amount used to repurchase stock         93,805,000   $ 600,000,000        
Long-term debt         742,100,000 741,825,000          
Convertible debt, current         1,160,000,000            
Purchase From Accelerated Share Repurchase [Member]                      
Debt Instrument [Line Items]                      
Stock repurchased during period, value               $ 1,400,000,000      
Senior Notes Due 2019 [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, face amount         $ 1,000            
Stated interest rate percentage         0.50%       0.50%    
Convertible debt         $ 1,163,199,000 1,155,445,000     $ 1,440,000,000    
Temporary equity from convertible notes         $ 1,163,000 $ 8,110,000          
Proceeds from convertible debt                 1,420,000,000    
Payments for (proceeds from) hedge, investing activities                 $ 82,600,000    
Stock repurchased during period, value               1,500,000,000      
Convertible debt, conversion ratio         0.0139983            
Convertible debt, conversion price (in dollars per share) | $ / shares         $ 71.44            
Repurchase price as a percent of principal amount         100.00%            
Amortization of debt discount, effective interest method, percent         3.00%            
Long-term debt         $ 1,400,000,000            
Deferred tax liability, equity component         $ 8,200,000            
Shares of common stock covered by note hedges (shares) | shares         16,000,000            
Warrant transaction (shares) | shares       16,000,000              
Adjustment to number of shares of common stock covered by note hedges and warrant transactions (shares) | shares         20,000,000            
Strike price of warrants (in dollars per share) | $ / shares         $ 94.62            
Shares of common stock covered by warrant transactions (shares) | shares         20,100,000            
Warrants exercised (shares) | shares         0            
Privately Negotiated Transaction [Member]                      
Debt Instrument [Line Items]                      
Amount used to repurchase stock               $ 101,000,000      
GetGo, Inc. [Member] | Senior Notes Due 2019 [Member]                      
Debt Instrument [Line Items]                      
Convertible debt, conversion price (in dollars per share) | $ / shares                     $ 71.44
Unsecured Debt [Member] | 2027 Notes [Member]                      
Debt Instrument [Line Items]                      
Debt instrument, face amount   $ 750,000,000                  
Stated interest rate percentage   4.50%                  
Proceeds from issuance of 2027 Notes, net of issuance costs   $ 741,000,000                  
Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Term     5 years                
Credit facility, maximum borrowing capacity     $ 250,000,000                
Additional borrowing capacity     $ 250,000,000                
Amount outstanding         $ 0            
Consolidated leverage ratio     3.5                
Consolidated interest coverage ratio     3.0                
Prior to September 1, 2017 [Member] | Unsecured Debt [Member] | 2027 Notes [Member]                      
Debt Instrument [Line Items]                      
Redemption price as percent of aggregate principle amount (percent)   100.00%                  
Upon Change of Control Prior to Maturity [Member] | Unsecured Debt [Member] | 2027 Notes [Member]                      
Debt Instrument [Line Items]                      
Redemption price as percent of aggregate principle amount (percent)   101.00%                  
Letter of Credit [Member] | Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Credit facility, maximum borrowing capacity     $ 25,000,000                
Swing Line Loans [Member] | Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Credit facility, maximum borrowing capacity     $ 10,000,000                
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Basis spread on LIBOR (percent)         1.10%            
Minimum [Member] | Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Quarterly facility fee (percent)         0.125%            
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Basis spread on LIBOR (percent)         1.00%            
Maximum [Member] | Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Quarterly facility fee (percent)         0.20%            
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Basis spread on LIBOR (percent)         1.30%            
Subsequent Event [Member] | Senior Notes Due 2019 [Member]                      
Debt Instrument [Line Items]                      
Extinguishment of Debt, Amount $ 1,160,000,000                    
Shares issued upon conversion of debt (shares) | shares 4.9                    
Common Stock [Member]                      
Debt Instrument [Line Items]                      
Shares issued upon conversion of debt (shares) | shares           1,300,000