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Basis of Presentation and Significant Accounting Policies - Narrative (Details)
$ / shares in Units, £ in Thousands
1 Months Ended 9 Months Ended
Sep. 25, 2020
USD ($)
$ / shares
shares
Aug. 28, 2020
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Apr. 02, 2020
USD ($)
Nov. 30, 2018
GBP (£)
Subsidiary, Sale of Stock [Line Items]            
Dividends payable (USD per share) | $ / shares   $ 1.50        
Dividends payable | $   $ 392,489,000        
Stock options exercise price reduction (USD per share) | $ / shares   $ 1.50        
Stock options exercise price, lower limit (USD per share) | $ / shares   $ 0.01        
Not Designated as Hedging Instrument            
Subsidiary, Sale of Stock [Line Items]            
Derivative notional amount | £           £ 65,000
Interest Rate Swap | Not Designated as Hedging Instrument            
Subsidiary, Sale of Stock [Line Items]            
Derivative notional amount | $     $ 200,000,000   $ 200,000,000  
Term of contract (in years)     10 years      
Public Stock Offering - Shares From Existing Shareholders            
Subsidiary, Sale of Stock [Line Items]            
Payments of expenses associated with initial public offering | $       $ 26,130,000    
Public Stock Offering - Shares From Existing Shareholders | Class B Common Stock            
Subsidiary, Sale of Stock [Line Items]            
Number of shares sold (in shares) | shares 12,360,991          
Price per share sold (USD per share) | $ / shares $ 22.00          
IPO | Class B Common Stock            
Subsidiary, Sale of Stock [Line Items]            
Number of shares sold (in shares) | shares 0          
Sale of stock, consideration received | $ $ 0