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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	6 Months Ended
	Apr. 30, 2021	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Apr. 30, 2021	Sep. 30, 2021	Jun. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 90.3	$ 202.8	$ 413.3		$ 397.4		$ 731.7
Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	90.3	202.8	413.3		397.4		731.7
UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	19.6	41.1	63.1		75.7		128.7
NORWAY | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	19.3	40.5	28.1		73.3		52.4
US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	17.6	30.9	125.8		74.4		176.4
SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	12.0	25.2	35.1		53.6		73.2
MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	6.1	18.9	20.6		44.3		42.7
Other | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 15.7	$ 46.2	$ 140.6		$ 76.1		$ 258.3
Floaters | US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	62.00%	56.00%	77.00%	66.00%	64.00%	4.00%
Floaters | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	4.00%	41.00%			49.00%
Jackups | US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage				7.00%
Jackups | SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	55.00%	57.00%	57.00%		57.00%		59.00%
Jackups | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		59.00%	84.00%				89.00%

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