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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 |  |  |  |  |

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