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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	6 Months Ended
	Apr. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Apr. 30, 2021	Jun. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 90.3	$ 202.8	$ 388.8	$ 397.4	$ 845.4
Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	90.3	202.8	388.8	397.4	845.4
SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	12.0	25.2	57.3	53.6	141.2
UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	19.6	41.1	52.8	75.7	105.3
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	66.6	74.4	145.3
NORWAY | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	19.3	40.5	46.5	73.3	87.5
MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	6.1	18.9	22.7	44.3	38.7
AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	0.9	17.8	72.3	1.0	98.3
Other | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 14.8	$ 28.4	$ 70.6	$ 75.1	$ 229.1
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%	66.00%	64.00%	61.00%
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%	35.00%	49.00%	58.00%
Floaters | AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	78.00%	58.00%	100.00%	77.00%	89.00%
Jackups | US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage			6.00%		12.00%
Jackups | MEXICO | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	96.00%	59.00%	65.00%	51.00%	42.00%
Jackups | AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	22.00%	42.00%		23.00%
Jackups | Total S.A. | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	55.00%	57.00%	62.00%	57.00%	57.00%

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