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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended			4 Months Ended	8 Months Ended	12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues				$ 397.4	$ 835.0	$ 1,602.5	$ 1,427.2
Operating expenses - Contract drilling (exclusive of depreciation)				343.8	724.1	1,383.2	1,470.4
Asset Impairment Charges	$ 34.5	$ 34.5	$ 5.6	756.5	0.0	34.5	3,646.2
Debtor in possession financing fees and payments on Backstop Commitment Agreement				159.6	66.1	91.2	540.8
General and administrative				30.7	58.2	80.9	214.6
Income (Loss) from Equity Method Investments				(3.1)	(6.1)	(24.5)	7.8
OPERATING LOSS				(890.1)	(7.3)	37.2	(4,334.5)
Property and equipment, net				909.1	890.9	977.2	10,960.5
Capital expenditures				8.7	50.2	207.0	93.8
Other Operating Income				0.0	0.0	0.0	118.1
Floaters [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues				115.7	254.5	700.5	505.8
Operating expenses - Contract drilling (exclusive of depreciation)				106.5	250.7	646.0	566.1
Asset Impairment Charges				756.5		34.5	3,386.2
Debtor in possession financing fees and payments on Backstop Commitment Agreement				72.1	31.0	50.0	262.8
General and administrative				0.0	0.0	0.0	0.0
Income (Loss) from Equity Method Investments				0.0	0.0	0.0	0.0
OPERATING LOSS				(819.4)	(27.2)	(30.0)	(3,591.2)
Property and equipment, net				419.3	408.2	487.5	6,413.4
Capital expenditures				3.3	26.0	152.9	25.1
Other Operating Income							118.1
Jackups [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues				232.4	487.1	744.2	765.3
Operating expenses - Contract drilling (exclusive of depreciation)				175.0	365.2	538.9	659.5
Asset Impairment Charges				0.0		0.0	254.3
Debtor in possession financing fees and payments on Backstop Commitment Agreement				69.7	32.0	36.1	217.2
General and administrative				0.0	0.0	0.0	0.0
Income (Loss) from Equity Method Investments				0.0	0.0	0.0	0.0
OPERATING LOSS				(12.3)	89.9	169.2	(365.7)
Property and equipment, net				401.4	401.9	391.7	3,912.6
Capital expenditures				5.4	23.7	53.5	58.9
Other Operating Income							0.0
ARO | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues				163.5	307.1	459.5	549.4
Operating expenses - Contract drilling (exclusive of depreciation)				116.1	246.2	341.8	388.2
Asset Impairment Charges				0.0		0.0	0.0
Debtor in possession financing fees and payments on Backstop Commitment Agreement				21.0	44.2	63.4	54.8
General and administrative				4.2	13.6	18.7	24.2
Income (Loss) from Equity Method Investments				0.0	0.0	0.0	0.0
OPERATING LOSS				22.2	3.1	35.6	82.2
Property and equipment, net				730.7	730.6	775.6	736.2
Capital expenditures				14.9	41.8	24.6	136.1
Other Operating Income							0.0
Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues				49.3	93.4	157.8	156.1
Operating expenses - Contract drilling (exclusive of depreciation)				19.9	38.9	76.4	82.8
Asset Impairment Charges				0.0		0.0	5.7
Debtor in possession financing fees and payments on Backstop Commitment Agreement				14.8	2.8	4.6	44.8
General and administrative				0.0	0.0	0.0	0.0
Income (Loss) from Equity Method Investments				0.0	0.0	0.0	0.0
OPERATING LOSS				14.6	51.7	76.8	22.8
Property and equipment, net				50.5	46.0	56.8	577.9
Capital expenditures				0.0	0.0	0.0	0.0
Other Operating Income							0.0
Reconciling Items [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenues				(163.5)	(307.1)	(459.5)	(549.4)
Operating expenses - Contract drilling (exclusive of depreciation)				(73.7)	(176.9)	(219.9)	(226.2)
Asset Impairment Charges				0.0		0.0	0.0
Debtor in possession financing fees and payments on Backstop Commitment Agreement				(18.0)	(43.9)	(62.9)	(38.8)
General and administrative				26.5	44.6	62.2	190.4
Income (Loss) from Equity Method Investments				(3.1)	(6.1)	(24.5)	7.8
OPERATING LOSS				(95.2)	(124.8)	(214.4)	(482.6)
Property and equipment, net				(692.8)	(695.8)	(734.4)	(679.6)
Capital expenditures				$ (14.9)	$ (41.3)	$ (24.0)	(126.3)
Other Operating Income							$ 0.0

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