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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, 2020	Dec. 31, 2019
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
TOTAL [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	0.00%	9.00%	8.00%	16.00%
BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	14.00%	11.00%	11.00%	9.00%
Other Customers [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	86.00%	80.00%	81.00%	75.00%
Floaters [Member] | TOTAL [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage			71.00%	93.00%
Floaters [Member] | BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	37.00%	21.00%	30.00%	16.00%
Other Rigs [Member] | BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage			51.00%	43.00%
Jackups Member | BP [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	17.00%	20.00%	19.00%	41.00%

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

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