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Commitments and contingencies (Details) - Commitments and Maturity of Commitments - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]    
Delivery installment $ 621.0 $ 621.0
Back-end fee 9.0 $ 9.0
Delivery instalments for jack-up rigs, less than one year 0.0  
Delivery instalments for jack-up rigs, 2 years 621.0  
Delivery installments for jack-up rigs, 3 years 0.0  
Delivery instalments for jack-up rigs, more than 3 years 0.0  
Delivery instalments for jack-up rigs, Total $ 621.0