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Supplemental Financial Information Supplemental Financial Information (Major Customers) (Details) - Customer Concentration Risk [Member] - Revenue	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%
BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	17.00%	11.00%	15.00%
Other Customers [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	83.00%	89.00%	85.00%
Floaters [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	61.00%	53.00%	44.00%
Floaters [Member] | BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	9.00%	0.00%	6.00%
Floaters [Member] | Other Customers [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	52.00%	53.00%	38.00%
Jackups Member
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	32.00%	37.00%	46.00%
Jackups Member | BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	3.00%	5.00%	3.00%
Jackups Member | Other Customers [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	29.00%	32.00%	43.00%
Managed Rig
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	7.00%	10.00%	10.00%
Managed Rig | BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	5.00%	6.00%	6.00%
Managed Rig | Other Customers [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	2.00%	4.00%	4.00%

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
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-21

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

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