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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Apr. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES			$ 437.2	$ 326.7	$ 397.4	$ 529.5	$ 1,168.9
Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES		$ 529.5	437.2	326.7	397.4		1,168.9
UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 111.0		71.4	69.9	75.7		200.1
NORWAY | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	89.9		38.6	49.4	73.3		91.0
US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	71.1		95.2	40.2	74.4		271.6
SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	58.7		30.9	33.5	53.6		104.1
MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	52.3		10.7	33.4	44.3		53.4
Other | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 95.3		138.6	66.9	75.1		357.8
AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES			$ 51.8	$ 33.4	$ 1.0	$ 51.2	$ 90.9
Floaters | US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage			65.00%	46.00%	64.00%	50.00%	66.00%
Floaters | AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage			78.00%	64.00%	77.00%	62.00%	80.00%
Jackups | US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage			8.00%				7.00%
Jackups | SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage			54.00%	56.00%	57.00%	57.00%	58.00%
Jackups | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage				52.00%	51.00%	54.00%	91.00%

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