Business Combination, Contingent Consideration Arrangements, Gain (Loss) on Revaluation

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- Definition

Contract Revenue Cost per Day, Tranche One

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Contract Revenue Cost per Day, Tranche Two

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- Definition

Refers to percentage of management fees charged.

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Management and Administrative Service Agreement, Termination Notice Period

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- Definition

Markup Charged on Costs to Related Parties, Percent

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- Definition

Net Contract Dayrate, Threshold

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- Definition

Percentage of Contract Revenue Cost per Day Payable, Tranche One

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Percentage of Contract Revenue Cost per Day Payable, Tranche Two

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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- Definition

Total distributions to each class of partners (i.e., general, limited and preferred partners).

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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.

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Related party transactions (Narrative) (Details) - USD ($)		12 Months Ended
	Jul. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Management fee percentage		5.00%		5.00%
Revaluation of contingent consideration		$ 700,000	$ 0	$ 89,900,000
Distributions				9,200,000
Seadrill
Related Party Transaction [Line Items]
Management fee percentage			5.00%
Management and administrative service agreement, termination notice period		90 days
Distributions				15,300,000
Seadrill \| Performance guarantee
Related Party Transaction [Line Items]
Guarantee		$ 15,000,000	$ 7,000,000
Seadrill \| Guarantee in favor of suppliers
Related Party Transaction [Line Items]
Guarantee		0	1,000,000
Seadrill \| West Vela
Related Party Transaction [Line Items]
Contract revenue cost per day, tranche one		42,000
Contract revenue cost per day, tranche two		$ 40,000
Seadrill \| West Polaris
Related Party Transaction [Line Items]
Percentage of contract revenue cost per day payable, tranche one		100.00%
Net contract dayrate, threshold		$ 450,000
Percentage of contract revenue cost per day payable, tranche two		50.00%
Seadrill \| Credit Facility $100M \| Revolving Credit Facility
Related Party Transaction [Line Items]
Maximum borrowing capacity	$ 100,000,000
Commitment fee percentage	2.00%
Seadrill \| Minimum
Related Party Transaction [Line Items]
Mark-up charged on costs to related parties, percent		4.85%
Seadrill \| Maximum
Related Party Transaction [Line Items]
Mark-up charged on costs to related parties, percent		8.00%
London Interbank Offered Rate (LIBOR) \| Seadrill \| Credit Facility $100M \| Revolving Credit Facility
Related Party Transaction [Line Items]
Basis spread (as percent)	5.00%
Cash distribution \| Seadrill
Related Party Transaction [Line Items]
Distributions			$ 6,200,000	$ 6,100,000