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Debt (Narrative) (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 15, 2017
USD ($)
Feb. 01, 2017
$ / shares
Jan. 07, 2015
USD ($)
Apr. 30, 2014
shares
Jun. 30, 2018
day
Sep. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Dec. 31, 2014
USD ($)
Oct. 15, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                        
Temporary equity from convertible notes           $ 19,286,000   $ 19,286,000       $ 0
Conversion notices received, amount           224,800,000   224,800,000        
Amount used to repurchase stock               881,153,000 $ 574,957,000      
Long-term debt           741,551,000   741,551,000       2,127,474,000
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   1,000        
Stated interest rate percentage                   0.50%    
Convertible debt           1,415,970,000   1,415,970,000   $ 1,440,000,000   1,386,324,000
Temporary equity from convertible notes           19,286,000   $ 19,286,000       $ 0
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   0.0139061                    
Convertible debt threshold trading days | day         20              
Convertible debt threshold consecutive trading days | day         30              
Convertible debt threshold percentage of stock price trigger         130.00%              
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   $ 1,400,000,000        
Deferred tax liability, equity component           $ 8,200,000   $ 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           $ 95.25   $ 95.25        
Warrants exercised (shares) | shares               0        
Privately Negotiated Transaction [Member]                        
Debt Instrument [Line Items]                        
Amount used to repurchase stock             $ 101,000,000          
GetGo, Inc. [Member]                        
Debt Instrument [Line Items]                        
Convertible debt, conversion price (in dollars per share) | $ / shares   $ 71.91                    
GetGo, Inc. [Member] | Senior Notes Due 2019 [Member]                        
Debt Instrument [Line Items]                        
Convertible debt, conversion price (in dollars per share) | $ / shares   $ 71.91                    
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]                        
Credit facility, maximum borrowing capacity     $ 250,000,000                  
Additional borrowing capacity     $ 250,000,000                  
Amount outstanding           $ 0   $ 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] | Senior Notes Due 2019 [Member]                        
Debt Instrument [Line Items]                        
Last reported sale price of common stock for the period (in USD per share) | $ / shares           $ 93.48   $ 93.48        
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%        
Other Liabilities [Member] | Senior Notes Due 2019 [Member]                        
Debt Instrument [Line Items]                        
Convertible debt           $ 1,420,000,000   $ 1,420,000,000        
Subsequent Event [Member]                        
Debt Instrument [Line Items]                        
Conversion notices received, amount                     $ 48,200,000