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Financing and Capital - Narrative (Details)
3 Months Ended 9 Months Ended
Jun. 15, 2019
USD ($)
Mar. 20, 2019
USD ($)
Mar. 01, 2019
USD ($)
Feb. 28, 2019
USD ($)
Feb. 22, 2019
USD ($)
$ / shares
Feb. 19, 2019
$ / shares
Sep. 27, 2019
USD ($)
Sep. 27, 2019
USD ($)
Mar. 29, 2019
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                    
Debt discounts, premiums and issuance costs             $ 113,700,000 $ 113,700,000   $ 17,000,000.0
Share closing price (in dollars per share) | $ / shares           $ 80.48        
Payment of outstanding principal       $ 400,000,000.0            
Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Debt term               5 years    
Senior unsecured revolving credit facility             2,000,000,000.0 $ 2,000,000,000.0    
Outstanding borrowings             0 0    
Convertible Debt                    
Debt Instrument [Line Items]                    
Interest expense             $ 13,300,000 $ 32,000,000.0    
0.875% senior convertible notes due 2022 | Convertible Debt                    
Debt Instrument [Line Items]                    
Principal amount         $ 1,300,000,000          
Interest rate, stated percentage         0.875%   0.875% 0.875% 0.875%  
Conversion ratio         0.009378          
Initial conversion price (in dollars per share) | $ / shares         $ 106.64          
Threshold percentage of stock price trigger           32.50%        
Proceeds from the issuance of convertible notes         $ 1,400,000,000          
Discount at issuance         $ 102,200,000          
Effective interest rate         3.38%          
Debt issuance costs         $ 24,300,000          
Interest expense related to contractual coupon rate             $ 3,100,000 $ 7,600,000    
Amortization of debt issuance costs             1,900,000 $ 4,700,000    
Discount amortization period               3 years    
Unamortized discount         102,200,000   $ 82,500,000 $ 82,500,000    
Senior Unsecured Notes due 2022, Over-Allotment Option | Convertible Debt                    
Debt Instrument [Line Items]                    
Principal amount         $ 187,500,000          
Delayed-draw term loan due 2020 | Line of credit                    
Debt Instrument [Line Items]                    
Debt term     364 days              
Long-term debt     $ 1,000,000,000.0              
Proceeds from line of credit   $ 1,000,000,000.0                
Interest rate at the end of the period             2.78% 2.78%    
Delayed-draw term loan due 2020 | Line of credit | London Interbank Offered Rate (LIBOR)                    
Debt Instrument [Line Items]                    
Basis spread on variable interest rate     0.75%              
1.80% senior unsecured notes due 2019 | Senior Notes                    
Debt Instrument [Line Items]                    
Interest rate, stated percentage             1.80% 1.80%   1.80%
Payment of outstanding principal $ 55,300,000                  
Debt Instrument, Redemption, Period One | 0.875% senior convertible notes due 2022 | Convertible Debt                    
Debt Instrument [Line Items]                    
Redemption price percentage         100.00%          
Debt Instrument, Redemption, Period Two | 0.875% senior convertible notes due 2022 | Convertible Debt                    
Debt Instrument [Line Items]                    
Redemption price percentage         100.00%          
Amount outstanding percentage         25.00%