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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 397.4	$ 835.0	$ 1,427.2	$ 2,053.2
Operating expenses - Contract drilling (exclusive of depreciation)	343.8	728.7	1,470.4	1,807.8
Asset Impairment Charges	756.5	0.0	3,646.2	104.0
Debtor in possession financing fees and payments on Backstop Commitment Agreement	159.6	66.1	540.8	609.7
General and administrative	30.7	58.2	214.6	188.9
Income (Loss) from Equity Method Investments	(3.1)	(6.1)	7.8	12.6
OPERATING LOSS	(890.1)	(11.9)	(4,334.5)	(669.8)
Property and equipment, net	909.1	890.9	10,960.5	15,096.9
Capital expenditures	8.7	50.2	93.8	227.0
Other Operating Income	0.0	0.0	118.1	0.0
Floaters [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	115.7	254.5	505.8	1,014.4
Operating expenses - Contract drilling (exclusive of depreciation)	106.5	250.7	566.1	785.0
Asset Impairment Charges	756.5		3,386.2	88.2
Debtor in possession financing fees and payments on Backstop Commitment Agreement	72.1	31.0	262.8	362.3
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)	(3,591.2)	(221.1)
Property and equipment, net	419.3	408.2	6,413.4	10,073.1
Capital expenditures	3.3	26.0	25.1	31.4
Other Operating Income			118.1
Jackups [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	232.4	487.1	765.3	834.6
Operating expenses - Contract drilling (exclusive of depreciation)	175.0	365.2	659.5	711.3
Asset Impairment Charges	0.0		254.3	10.2
Debtor in possession financing fees and payments on Backstop Commitment Agreement	69.7	32.0	217.2	203.3
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	(365.7)	(90.2)
Property and equipment, net	401.4	401.9	3,912.6	4,322.7
Capital expenditures	5.4	23.7	58.9	184.6
Other Operating Income			0.0
ARO | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	163.5	307.1	549.4	410.5
Operating expenses - Contract drilling (exclusive of depreciation)	116.1	246.2	388.2	280.2
Asset Impairment Charges	0.0		0.0	0.0
Debtor in possession financing fees and payments on Backstop Commitment Agreement	21.0	44.2	54.8	40.3
General and administrative	4.2	13.6	24.2	27.1
Income (Loss) from Equity Method Investments	0.0	0.0	0.0	0.0
OPERATING LOSS	22.2	3.1	82.2	62.9
Property and equipment, net	730.7	730.6	736.2	650.7
Capital expenditures	14.9	41.8	136.1	27.5
Other Operating Income			0.0
Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	49.3	93.4	156.1	204.2
Operating expenses - Contract drilling (exclusive of depreciation)	19.9	38.9	82.8	111.0
Asset Impairment Charges	0.0		5.7	0.0
Debtor in possession financing fees and payments on Backstop Commitment Agreement	14.8	2.8	44.8	25.5
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	22.8	67.7
Property and equipment, net	50.5	46.0	577.9	620.9
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)	(549.4)	(410.5)
Operating expenses - Contract drilling (exclusive of depreciation)	(73.7)	(172.3)	(226.2)	(79.7)
Asset Impairment Charges	0.0		0.0	5.6
Debtor in possession financing fees and payments on Backstop Commitment Agreement	(18.0)	(43.9)	(38.8)	(21.7)
General and administrative	26.5	44.6	190.4	161.8
Income (Loss) from Equity Method Investments	(3.1)	(6.1)	7.8	12.6
OPERATING LOSS	(95.2)	(129.4)	(482.6)	(489.1)
Property and equipment, net	(692.8)	(695.8)	(679.6)	(570.5)
Capital expenditures	$ (14.9)	$ (41.3)	(126.3)	$ (16.5)
Other Operating Income			$ 0.0

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