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General Information (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 25 Months Ended
Feb. 24, 2023
shares
Jan. 31, 2023
shares
Jul. 31, 2023
USD ($)
shares
Apr. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
rig
shares
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2023
USD ($)
rig
shares
Jun. 30, 2022
USD ($)
shares
Aug. 17, 2023
USD ($)
shares
Aug. 16, 2023
shares
Mar. 31, 2023
USD ($)
Dec. 31, 2022
shares
Jul. 31, 2021
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Issue of common shares (in shares) | shares 10,000,000 15,000,000                      
Proceeds from share issuance, net of issuance cost         $ 0.0 $ 3.6 $ 0.0 $ 37.7          
Common stock, shares issued (in shares) | shares         254,263,598 152,901,508 254,263,598 152,901,508       229,263,598  
At-The-Market offering                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Amount authorized for issuance                         $ 40.0
Subsequent event                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Common stock, shares issued (in shares) | shares     255,557,553             256,557,553      
Subsequent event | At-The-Market offering                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Issue of common shares (in shares) | shares     1,293,955                    
Proceeds from share issuance, net of issuance cost     $ 9.7                    
Number of shares sold in transaction (in shares) | shares                 3,643,955        
Sale of stock, consideration received on transaction                 $ 18.4        
New DNB Facility                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Principal       $ 175.0             $ 150.0    
Proceeds from issuance of long-term debt       $ 25.0                  
Jack-up rigs                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Number of rigs owned | rig         22   22            
Number of rigs under construction | rig         2   2            
Number of jack-up rigs owned, including jack-up rigs under construction | rig         24   24            
Number of jack-up rigs scheduled for delivery | rig         2   2