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Stockholders' Equity - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 17, 2020
Jun. 02, 2020
Jun. 28, 2019
Dec. 19, 2018
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Jun. 17, 2019
Class of Stock                        
Total number of common and preferred shares authorized (in shares)         750,000,000       750,000,000      
Common stock, shares authorized (in shares)         700,000,000       700,000,000   700,000,000  
Common stock, par value (in dollars per share)         $ 0.01       $ 0.01   $ 0.01  
Preferred stock, shares authorized (in shares)         50,000,000       50,000,000   50,000,000  
Preferred stock, par value (in dollars per share)         $ 0.01       $ 0.01   $ 0.01  
Shares issued in IPO (in shares)     50,000,000                  
Future stock to be issued during period, shares sold pursuant to the exercise In full of underwriters' option to purchase additional common stock     15,000,000                  
Offering forward price (in dollars per share) $ 21.37 $ 19.64                    
Share price (in dollars per share)     $ 21.50                  
Aggregate offering value of shares     $ 1,100,000,000   $ 1,276,624,000 $ 199,877,000 $ 1,036,280,000 $ 128,265,000        
Proceeds from issuance of common stock   $ 1,300,000,000 $ 1,000,000,000.0           $ 1,476,717,000 $ 1,165,008,000    
Additional shares subject to forward sale agreement (in shares)   65,000,000 65,000,000           65,000,000 0    
ATM Stock Offering Program                        
Class of Stock                        
Shares issued in IPO (in shares)                 7,500,000 6,107,633 6,107,633  
Proceeds from issuance of common stock                 $ 200,000,000.0   $ 128,300,000  
Maximum amount of shares to be sold       $ 750,000,000.0                
Plan                        
Class of Stock                        
Shares issued in IPO (in shares) 29,900,000                      
Future stock to be issued during period, shares sold pursuant to the exercise In full of underwriters' option to purchase additional common stock 3,900,000                      
Share price (in dollars per share)                       $ 22.15
Aggregate offering value of shares $ 662,300,000                      
Pro Forma                        
Class of Stock                        
Shares issued related to forward sale (shares) 29,900,000                      
Offering forward price (in dollars per share)         $ 21.07       $ 21.07      
Forward agreement on the proceeds from issuance of common stock                 $ 630,100,000      
Forward share agreements, payments for repurchase of common stock                 $ 26,400,000      
Forward contract indexed to issuer's equity (in shares)                 1,300,000