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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - Revenue Benchmark [Member] - Customer Concentration Risk	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%
British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	13.00%	16.00%
Shell
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	7.00%	11.00%
ENI
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	14.00%	10.00%
Other Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	66.00%	63.00%
Floaters
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	50.00%	31.00%
Floaters | British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	2.00%	7.00%
Floaters | Shell
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.00%	7.00%
Floaters | ENI
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	7.00%	4.00%
Floaters | Other Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	36.00%	13.00%
Jackups
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	39.00%	57.00%
Jackups | British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.00%	2.00%
Jackups | Shell
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	2.00%	4.00%
Jackups | ENI
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	7.00%	6.00%
Jackups | Other Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	25.00%	45.00%
Managed Rigs
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	11.00%	12.00%
Managed Rigs | British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	6.00%	7.00%
Managed Rigs | Shell
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	0.00%	0.00%
Managed Rigs | ENI
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	0.00%	0.00%
Managed Rigs | Other Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	5.00%	5.00%

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
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
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-Publisher FASB
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-20

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482861/275-10-50-18

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482861/275-10-50-20

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- Definition

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+ References

No definition available.

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