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Supplemental Financial Information Supplemental Financial Information (Major Customers) (Details) - Customer Concentration Risk [Member] - Revenue | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 100.00% | 100.00% | 100.00% | 100.00%
BP [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 14.00% | 11.00% | 11.00% | 15.00%
Other Customers [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 86.00% | 89.00% | 89.00% | 85.00%
Floaters [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 29.00% | 31.00% | 53.00% | 44.00%
Floaters [Member] | BP [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 5.00% | 2.00% | 0.00% | 6.00%
Floaters [Member] | Other Customers [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 24.00% | 29.00% | 53.00% | 38.00%
Jackups Member |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 59.00% | 58.00% | 37.00% | 46.00%
Jackups Member | BP [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 2.00% | 2.00% | 5.00% | 3.00%
Jackups Member | Other Customers [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 57.00% | 56.00% | 32.00% | 43.00%
Managed Rig |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 12.00% | 11.00% | 10.00% | 10.00%
Managed Rig | BP [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 7.00% | 7.00% | 6.00% | 6.00%
Managed Rig | Other Customers [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 5.00% | 4.00% | 4.00% | 4.00%

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- 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 -Subparagraph (a) -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 + Details
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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. + Details
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