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Long-Term Debt - Additional Information (Details)
1 Months Ended 12 Months Ended
Apr. 30, 2020
USD ($)
d
$ / shares
shares
Aug. 31, 2019
USD ($)
d
$ / shares
shares
Aug. 31, 2018
USD ($)
Jul. 31, 2016
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Feb. 28, 2018
USD ($)
Debt Instrument [Line Items]                
Proceeds from issuance of convertible notes, net of issuance costs         $ 988,582,000 $ 1,251,411,000    
Amortization of debt discount and issuance costs         81,401,000 17,797,000    
Five-Year Senior Unsecured Revolving Credit Facility                
Debt Instrument [Line Items]                
Credit facility expiration period       5 years        
Maximum borrowing capacity     $ 1,200,000,000 $ 1,100,000,000       $ 1,250,000,000
Annual commitment fee       0.10%        
Origination fees       $ 0        
Credit facility expiration date     2018-08          
Amounts outstanding under the credit facility         0      
Standby Letters of Credit                
Debt Instrument [Line Items]                
Outstanding letters of credit         25,400,000      
LIBO | Five-Year Senior Unsecured Revolving Credit Facility                
Debt Instrument [Line Items]                
Basis spread on variable interest rate (percentage)       0.75%        
2025 Notes                
Debt Instrument [Line Items]                
Debt instrument, principal amount $ 1,000,000,000.0       $ 1,000,000,000      
Indenture date Apr. 28, 2020              
Proceeds from issuance of convertible notes, net of issuance costs $ 888,600,000              
Interest payment beginning date Nov. 01, 2020              
Debt instrument, interest rate 0.25%              
Debt instrument, interest rate terms         Interest is payable in cash semi-annually in arrears beginning on November 1, 2020 at a rate of 0.25% per year.      
Debt instrument, maturity date May 01, 2025              
Debt instrument, redemption price percentage 100.00%              
Carrying amount of equity component $ 289,900,000       $ 286,589,000      
Effective interest rate 7.39%              
Debt issuance costs allocated to equity component $ 3,300,000              
Debt issuance costs allocated to liability component $ 8,100,000              
Debt instrument convertible, amortization period         4 years 3 months 18 days      
If-converted value exceeding principal amount         $ 1,512,000,000      
Cap price, net cost         $ 100,000,000.0      
2025 Notes | Class A Non-voting Common Stock                
Debt Instrument [Line Items]                
Shares issued upon conversion of each $1000 principal amount | shares 46.1233              
Debt instrument, convertible principal amount used in conversion rate $ 1,000              
Conversion price per share | $ / shares $ 21.68              
Debt instrument convertible, percentage of conversion price 130.00%              
Debt instrument convertible, number of trading days | d 20              
Debt instrument, redemption price percentage 100.00%              
Cap price, per share | $ / shares         $ 32.12      
2025 Notes | Class A Non-voting Common Stock | Scenario One                
Debt Instrument [Line Items]                
Debt instrument convertible, percentage of conversion price 130.00%              
Debt instrument convertible, number of trading days | d 20              
Debt instrument convertible, number of consecutive trading days | d 30              
2025 Notes | Class A Non-voting Common Stock | Scenario Two                
Debt Instrument [Line Items]                
Debt instrument, convertible principal amount used in conversion rate   $ 1,000            
Debt instrument convertible, number of consecutive trading days | d   10            
Debt instrument, convertible, threshold business days   5 days            
2025 Notes | Class A Non-voting Common Stock | Scenario Two | Maximum                
Debt Instrument [Line Items]                
Debt instrument convertible, percentage of conversion price   98.00%            
2026 Notes                
Debt Instrument [Line Items]                
Debt instrument, principal amount   $ 1,265,000,000     $ 1,265,000,000 1,265,000,000    
Proceeds from issuance of convertible notes, net of issuance costs   $ 1,150,000,000            
Interest payment beginning date   Feb. 01, 2020            
Debt instrument, interest rate   0.75%            
Debt instrument, interest rate terms         Interest is payable in cash semi-annually in arrears beginning on February 1, 2020 at a rate of 0.75% per year.      
Debt instrument, maturity date   Aug. 01, 2026            
Carrying amount of equity component         $ 377,432,000 377,432,000    
Debt instrument convertible, amortization period         5 years 7 months 6 days      
Amortization of debt discount and issuance costs         $ 81,400,000 17,800,000    
Contractual interest expense         11,200,000 $ 3,700,000 $ 0  
If-converted value exceeding principal amount         1,309,000,000      
Cap price, net cost         $ 102,100,000      
2026 Notes | Class A Non-voting Common Stock                
Debt Instrument [Line Items]                
Shares issued upon conversion of each $1000 principal amount | shares   43.8481            
Debt instrument, convertible principal amount used in conversion rate   $ 1,000            
Conversion price per share | $ / shares   $ 22.81            
Cap price, per share | $ / shares         $ 32.58      
Initial Placement | 2025 Notes                
Debt Instrument [Line Items]                
Debt instrument, principal amount $ 850,000,000.0              
Over-Allotment Option | 2025 Notes                
Debt Instrument [Line Items]                
Debt instrument, principal amount $ 150,000,000.0