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%