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Segment information - Major Customers (Details) - Contract Revenues - Customer Concentration Risk	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
ConocoPhillips
Revenue, Major Customer [Line Items]
Concentration risk percentage	19.00%	13.00%
Lundin
Revenue, Major Customer [Line Items]
Concentration risk percentage	12.00%	0.00%
Equinor
Revenue, Major Customer [Line Items]
Concentration risk percentage	13.00%	19.00%
Sonagol
Revenue, Major Customer [Line Items]
Concentration risk percentage	10.00%	9.00%
Saudi Aramco
Revenue, Major Customer [Line Items]
Concentration risk percentage	9.00%	10.00%
Northern Ocean
Revenue, Major Customer [Line Items]
Concentration risk percentage	5.00%	14.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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