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Long-Term Debt - Syndicated Senior Secured Credit Facilities (Details)
$ in Millions
1 Months Ended
Jan. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Sep. 12, 2019
USD ($)
rig
Jun. 25, 2019
USD ($)
rig
shares
Jun. 30, 2020
Jan. 31, 2022
Dec. 31, 2021
USD ($)
Dec. 28, 2021
Jan. 30, 2021
Dec. 31, 2020
USD ($)
Credit Facility [Abstract]                    
Debt service coverage ratio         1.25          
Deferred amendment fee             $ 42.8     $ 42.8
Long-term debt             1,915.9     $ 1,906.2
Period 1                    
Credit Facility [Abstract]                    
Minimum book equity ratio   25.00%     25.00%          
Period 2                    
Credit Facility [Abstract]                    
Minimum book equity ratio   40.00%     40.00%          
Syndicated Senior Secured Credit Facilities                    
Credit Facility [Abstract]                    
Line of credit facility, maximum borrowing capacity       $ 450.0            
Number of jack-up rigs as security | rig       2            
Minimum number of shares required to maintain ownership (in shares) | shares       3,000,000            
Book value of jackup rigs pledged as collateral for long-term debt facilities             571.9      
Percentage covered for aggregate outstanding facility, amount                 140.00% 175.00%
Line of credit             272.7      
Deferred amendment fee             2.7      
Amount of facility utilised             11.2      
Long-term debt             272.7     $ 270.0
Revolving credit facility, amount available, undrawn             10.0      
Syndicated Senior Secured Credit Facilities | Period 1                    
Credit Facility [Abstract]                    
Minimum book equity ratio 30.00%             25.00%    
Minimum cash requirement   $ 5.0                
Syndicated Senior Secured Credit Facilities | Period 1 | Subsequent Event                    
Credit Facility [Abstract]                    
Minimum book equity ratio           25.00%        
Syndicated Senior Secured Credit Facilities | Period 2                    
Credit Facility [Abstract]                    
Minimum book equity ratio               30.00%    
Maximum book equity ratio 35.00%                  
Minimum cash requirement   10.0                
Syndicated Senior Secured Credit Facilities | Period 2 | Subsequent Event                    
Credit Facility [Abstract]                    
Minimum book equity ratio           30.00%        
Syndicated Senior Secured Credit Facilities | Period 3                    
Credit Facility [Abstract]                    
Minimum book equity ratio               35.00%    
Minimum cash requirement $ 5.0 15.0                
Syndicated Senior Secured Credit Facilities | Period 3 | Subsequent Event                    
Credit Facility [Abstract]                    
Minimum book equity ratio           35.00%        
Syndicated Senior Secured Credit Facilities | Period 4                    
Credit Facility [Abstract]                    
Minimum cash requirement 10.0 20.0                
Syndicated Senior Secured Credit Facilities | Period 5                    
Credit Facility [Abstract]                    
Minimum cash requirement $ 15.0 $ 30.0                
Minimum cash requirement, percentage   3.00%                
Senior Secured Credit Facilities                    
Credit Facility [Abstract]                    
Line of credit facility, maximum borrowing capacity       $ 230.0            
New Build Facility                    
Credit Facility [Abstract]                    
Line of credit facility, maximum borrowing capacity       50.0            
Issuance of Guarantees and Trade Finance Instruments                    
Credit Facility [Abstract]                    
Line of credit facility, maximum borrowing capacity       70.0     $ 70.0      
Incremental Facility                    
Credit Facility [Abstract]                    
Line of credit facility, maximum borrowing capacity       $ 100.0            
Number of jack-up rigs as security | rig     1              
Proceeds from lines of credit     $ 50.0              
Number of jack-up rigs secured by mortgage | rig       7            
Clifford Capital Pte. Ltd. Loan Agreement                    
Credit Facility [Abstract]                    
Line of credit facility, maximum borrowing capacity     $ 25.0