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Summary of Significant Accounting Policies - Additional Information (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Feb. 07, 2020
shares
Feb. 04, 2020
$ / shares
shares
Mar. 31, 2020
USD ($)
Segment
Mar. 31, 2019
USD ($)
Related Party Transaction [Line Items]        
Number of reportable segments | Segment     4  
R G H L Group        
Related Party Transaction [Line Items]        
Cost allocated to related party service provided | $     $ 2 $ 9
Related party transaction historical expenses not allocated | $     1 $ 4
Outstanding common stock shares exchanged immediately prior to IPO | shares   155,455    
R G H L Group | Underwriters        
Related Party Transaction [Line Items]        
Number of common stock shares sold | shares 7,075,500      
IPO | R G H L Group        
Related Party Transaction [Line Items]        
Issuance costs | $     $ 2  
Number of common stock shares sold | shares   54,245,500    
Shares issued, price per share | $ / shares   $ 26.00