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Newbuildings (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Apr. 30, 2020
Jan. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Carrying Value Of New Buildings [Roll Forward]        
Opening balance   $ 261.4 $ 135.5 $ 261.4
Additions     0.0 181.8
Capitalized interest     0.0 5.0
Transfers to jack-up rigs     0.0 (312.7)
Total newbuildings     135.5 135.5
Rigs Delivered Final Installment And Related Financing [Abstract]        
First Installment       115.2
Final Installment       181.8
Capitalized Costs       15.7
Transferred to Jack-Up Rigs     0.0 312.7
Heimdal        
Rigs Delivered Final Installment And Related Financing [Abstract]        
Delivery Financing   $ 90.9    
Shipyard   Keppel    
First Installment   $ 57.6    
Final Installment   90.9    
Capitalized Costs   8.4    
Transferred to Jack-Up Rigs   $ 156.9   156.9
Hild        
Rigs Delivered Final Installment And Related Financing [Abstract]        
Delivery Financing $ 90.9      
Shipyard Keppel      
First Installment $ 57.6      
Final Installment 90.9      
Capitalized Costs 7.3      
Transferred to Jack-Up Rigs $ 155.8     155.8
Keppel Rigs        
Rigs Delivered Final Installment And Related Financing [Abstract]        
Final Installment     $ 448.2 $ 448.2