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Common Shares - Narrative (Details)
 3 Months Ended 6 Months Ended
Feb. 24, 2023
$ / shares
shares
Feb. 23, 2023
$ / shares
shares
Jan. 31, 2023
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
shares
Apr. 19, 2023
kr / shares
shares
Mar. 31, 2023
shares
Feb. 28, 2023
USD ($)
shares
Feb. 22, 2023
USD ($)
shares
Dec. 31, 2022
$ / shares
shares
Class of Stock [Line Items]                        
Stock authorized during period (in shares)   60,000,000                    
Ordinary shares, par value (in dollars per share) | $ / shares $ 0.10 $ 0.10 $ 0.10 $ 0.10   $ 0.10           $ 0.10
Issue of common shares (in shares) 10,000,000   15,000,000                  
Common stock, shares issued but not available for trading (in shares)                 25,000,000      
Common stock, shares issued (in shares)       254,263,598 152,901,508 254,263,598 152,901,508         229,263,598
General and administrative expenses | $       $ 10,300,000 $ 9,600,000 $ 22,700,000 $ 18,800,000          
Drew Holdings Limited                        
Class of Stock [Line Items]                        
Common stock, shares issued but not available for trading (in shares)     15,000,000               15,000,000  
Drew Holdings Limited | Related party                        
Class of Stock [Line Items]                        
General and administrative expenses | $       300,000 $ 0 1,000,000.0 $ 0          
NYSE                        
Class of Stock [Line Items]                        
Common stock, shares issued (in shares)               25,000,000        
Oslo Bors                        
Class of Stock [Line Items]                        
Common stock, shares issued (in shares)               25,000,000        
$250m Convertible Bonds                        
Class of Stock [Line Items]                        
Share lending arrangement, consideration | $                     $ 0  
Principal | $       $ 250,000,000   $ 250,000,000       $ 250,000,000    
Share lending arrangement, shares authorized (in shares)       25,000,000   25,000,000       25,000,000    
Lending fee, per investor       0.50%   0.50%            
Lending fee       1.00%   1.00%            
Gross deferred finance charge, share lending arrangement | $     $ 12,400,000 $ 11,400,000   $ 11,400,000            
Counterparty default, minimum share price (NOK per share) | kr / shares               kr 56.36        
Share lending arrangement, shares outstanding (in shares)       16,154,645   16,154,645     14,232,778      
$250m Convertible Bonds | Drew Holdings Limited                        
Class of Stock [Line Items]                        
Share lending arrangement, shares issued (in shares)     15,000,000