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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		4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%	100.00%
British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	9.00%	11.00%	14.00%	9.00%	9.00%
Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	14.00%	5.00%	0.00%	9.00%	10.00%
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	77.00%	84.00%	86.00%	82.00%	81.00%
Floaters | British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	3.00%	14.00%	37.00%	2.00%	23.00%
Floaters | Total S.A.
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		32.00%			75.00%
Jackups | British Petroleum
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	24.00%	24.00%	17.00%	24.00%	21.00%

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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.

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