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Commitments and contingencies - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 30, 2021
Mar. 15, 2017
rig
companies
May 31, 2018
USD ($)
rig
Jun. 30, 2018
USD ($)
Dec. 31, 2021
USD ($)
rig
Dec. 31, 2020
USD ($)
May 30, 2018
rig
Keppel Rigs              
Other Commitments [Line Items]              
Number of premium newbuild jack-up drilling rigs acquired     5        
Total consideration | $     $ 742.5        
Pre-delivery installment fee | $       $ 288.0      
Period of each loan maturity after the respective delivery dates         5 years    
Loan maturity date, period extended 1 year            
Number of rigs to be delivered         2    
Remaining contracted installments outstanding, amount | $         $ 172.8 $ 172.8  
Number of rigs under construction             2
Transocean Rigs              
Other Commitments [Line Items]              
Number of premium newbuild jack-up drilling rigs acquired   5          
Remaining contracted installments outstanding, amount | $         $ 448.2 $ 448.2  
Number of high specification jack-up drilling rigs to be acquired   15          
Number of jack-up rig companies acquired | companies   8          
Number of premium newbuild jack-up drilling rigs delivered         2    
Number of premium newbuild jack-up drilling rigs under construction         3    
Number of rigs under construction   5