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Segment information - Major Customers (Details) - Contract Revenues - Customer Concentration Risk | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 100.00% | 100.00% | 100.00% | 100.00%
ConocoPhillips |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 13.00% | 8.00% | 16.00% | 11.00%
Equinor |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 7.00% | 5.00% | 12.00% | 16.00%
Northern Ocean |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 0.00% | 0.00% | 12.00% | 12.00%
Saudi Aramco |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 14.00% | 11.00% | 9.00% | 10.00%
LLOG |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 10.00% | 23.00% | 7.00% | 7.00%
Petrobras |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 6.00% | 4.00% | 5.00% | 4.00%
Total |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 24.00% | 19.00% | 4.00% | 18.00%
ExxonMobil |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 0.00% | 10.00% | 0.00% | 0.00%
Other |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk percentage | 26.00% | 20.00% | 35.00% | 22.00%

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