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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, 2022	Dec. 31, 2020
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%	15.00%	11.00%
Other Customers [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	86.00%	89.00%	85.00%	89.00%
Floaters [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	29.00%	31.00%	44.00%	35.00%
Floaters [Member] | BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	5.00%	2.00%	6.00%	3.00%
Floaters [Member] | Other Customers [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	24.00%	29.00%	38.00%	32.00%
Jackups Member
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	59.00%	58.00%	46.00%	54.00%
Jackups Member | BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	2.00%	2.00%	3.00%	2.00%
Jackups Member | Other Customers [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	57.00%	56.00%	43.00%	52.00%
Managed Rig
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	12.00%	11.00%	10.00%	11.00%
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%	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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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-Publisher FASB
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- Definition

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