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Financing and Capital - Narrative (Details)
3 Months Ended 6 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
Jun. 28, 2019
USD ($)
Jun. 28, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                  
Debt discounts, premiums and issuance costs             $ 125,400,000 $ 125,400,000 $ 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             13,200,000 18,700,000  
0.875% senior convertible notes due 2022 | Convertible Debt                  
Debt Instrument [Line Items]                  
Principal amount         $ 1,400,000,000   $ 1,300,000,000 $ 1,300,000,000  
Interest rate, stated percentage         0.875%   0.875% 0.875%  
Amortization of Debt Issuance Costs             $ 1,900,000 $ 2,800,000  
Initial conversion price (in dollars per share) | $ / shares         $ 106.64        
Conversion ratio         0.009378        
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 $ 102,200,000  
Effective interest rate             3.38% 3.38%  
Debt Issuance Costs, Net         $ 24,300,000        
Interest expense related to contractual coupon rate             $ 3,100,000 $ 4,400,000  
Discount amortization period               3 years  
Unamortized discount         102,200,000   $ 90,800,000 $ 90,800,000  
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             3.16% 3.16%  
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%  
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%