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Debt - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2020
USD ($)
$ / shares
Nov. 30, 2018
USD ($)
d
$ / shares
shares
Mar. 31, 2021
USD ($)
d
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 19, 2018
USD ($)
Senior Notes            
Debt Instrument [Line Items]            
Principal amount     $ 2,057,500,000   $ 2,057,500,000  
Senior Notes | Senior Convertible Notes due 2023            
Debt Instrument [Line Items]            
Principal amount   $ 850,000,000.0 $ 850,000,000.0   850,000,000.0  
Interest rate on convertible notes (as a percent)   0.75%        
Proceeds from issuance of convertible notes, net of issuance costs   $ 836,600,000        
Conversion ratio   0.0060869        
Conversion amount   $ 1,000        
Conversion price of convertible notes (USD per share) | $ / shares   $ 164.29        
Holder's repurchase price percentage in event of fundamental change (as a percent)     100.00%      
Number of trading days | d   60        
Proportion of conversion price (as a percent)     130.00%      
Redemption price (as a percent)     100.00%      
Stock counterparties to acquire with warrants purchased (shares) | shares   5,200,000        
Proceeds from sale of warrants   $ 183,800,000        
Exercise price of warrants or rights (USD per share) | $ / shares   $ 198.38        
Senior Notes | Senior Convertible Notes due 2025            
Debt Instrument [Line Items]            
Principal amount $ 1,210,000,000   $ 1,207,500,000   $ 1,207,500,000  
Interest rate on convertible notes (as a percent) 0.25%          
Proceeds from issuance of convertible notes, net of issuance costs $ 1,190,000,000          
Conversion ratio 0.0016655          
Conversion price of convertible notes (USD per share) | $ / shares $ 600.42          
Holder's repurchase price percentage in event of fundamental change (as a percent)     100.00%      
Proportion of conversion price (as a percent)     130.00%      
Senior Notes | Senior Convertible Notes due 2025 | Maximum            
Debt Instrument [Line Items]            
Conversion ratio 0.0023732          
Line of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity of revolving credit agreement     $ 200,000,000.0     $ 200,000,000.0
Option to increase revolving line of credit           $ 500,000,000.0
Value of unrestricted cash on hand threshold     $ 100,000,000.0      
Line of Credit | Minimum            
Debt Instrument [Line Items]            
Interest rate on convertible notes (as a percent)     0.375%      
Unused capacity fee (as a percent)     0.20%      
Line of Credit | Maximum            
Debt Instrument [Line Items]            
Interest rate on convertible notes (as a percent)     1.00%      
Unused capacity fee (as a percent)     0.30%      
Additional Paid-In Capital | Senior Notes | Senior Convertible Notes due 2023            
Debt Instrument [Line Items]            
Recognized additional paid-in capital from cash conversion option       $ 171,600,000    
Debt Instrument Conversion Term One | Senior Notes | Senior Convertible Notes due 2023 | Minimum            
Debt Instrument [Line Items]            
Number of trading days | d     20      
Proportion of applicable conversion price (as a percent)     130.00%      
Debt Instrument Conversion Term One | Senior Notes | Senior Convertible Notes due 2023 | Maximum            
Debt Instrument [Line Items]            
Number of trading days | d     30      
Debt Instrument Conversion Term One | Senior Notes | Senior Convertible Notes due 2025 | Minimum            
Debt Instrument [Line Items]            
Number of trading days | d     20      
Proportion of applicable conversion price (as a percent)     130.00%      
Debt Instrument Conversion Term One | Senior Notes | Senior Convertible Notes due 2025 | Maximum            
Debt Instrument [Line Items]            
Number of trading days | d     30      
Debt Instrument Conversion Term Two | Senior Notes | Senior Convertible Notes due 2023            
Debt Instrument [Line Items]            
Number of trading days | d     5      
Debt Instrument Conversion Term Two | Senior Notes | Senior Convertible Notes due 2023 | Maximum            
Debt Instrument [Line Items]            
Number of trading days | d     5      
Proportion of applicable conversion price (as a percent)     98.00%      
Debt Instrument Conversion Term Two | Senior Notes | Senior Convertible Notes due 2025            
Debt Instrument [Line Items]            
Number of trading days | d     5      
Debt Instrument Conversion Term Two | Senior Notes | Senior Convertible Notes due 2025 | Maximum            
Debt Instrument [Line Items]            
Number of trading days | d     5      
Proportion of applicable conversion price (as a percent)     98.00%      
Designated as Hedging Instrument | Senior Notes | Senior Convertible Notes due 2023            
Debt Instrument [Line Items]            
Stock issued upon conversion of senior notes (shares) | shares   5,200,000        
Equity component of 2025 Notes issuance, net of issuance costs   $ 218,900,000        
Designated as Hedging Instrument | Senior Notes | Senior Convertible Notes due 2025            
Debt Instrument [Line Items]            
Recognized additional paid-in capital from cash conversion option     $ 289,400,000      
London Interbank Offered Rate (LIBOR) | Line of Credit | Minimum            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)     1.375%      
London Interbank Offered Rate (LIBOR) | Line of Credit | Maximum            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)     2.00%