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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended		5 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 318.4	$ 307.1
Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 318.4	307.1
UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES		56.1	$ 65.6
NORWAY | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES		54.0	24.3
US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES		56.8	50.6
SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES		41.6	38.1
MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES		38.2	22.1
Other | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES		$ 60.4	$ 117.7
Floaters | US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	41.00%	65.00%	13.00%
Jackups | SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	62.00%	57.00%
Jackups | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	93.00%	56.00%

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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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