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Segment Information (Schedule Of Segment Reporting Information) (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, 2022	Apr. 30, 2021	Jun. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 90.3	$ 202.8	$ 413.3	$ 397.4	$ 731.7
Operating expenses
Contract drilling (exclusive of depreciation)	90.2	168.6	361.8	343.8	693.1
Loss on impairment	0.0	0.0	34.5	756.5	34.5
Depreciation expense	37.5	16.6	22.3	159.6	44.8
General and Administrative Expense	6.4	12.7	19.0	30.7	37.8
Equity in earnings of ARO	(1.2)	(4.8)	(8.7)	(3.1)	(13.0)
Operating Income (Loss)	(42.6)	9.7	(15.6)	(890.1)	(65.5)
Property, Plant and Equipment, Net	(909.1)	(897.8)	(931.7)	(909.1)	(931.7)	$ (890.9)
Operating Segments [Member] | Floaters
Segment Reporting Information [Line Items]
Revenues	18.4	49.7	188.1	115.7	287.8
Operating expenses
Contract drilling (exclusive of depreciation)	21.4	45.3	165.3	106.5	312.9
Loss on impairment			34.5	756.5	34.5
Depreciation expense	15.9	7.9	12.3	72.1	24.5
General and Administrative Expense	0.0	0.0	0.0	0.0	0.0
Equity in earnings of ARO	0.0	0.0	0.0	0.0	0.0
Operating Income (Loss)	(18.9)	(3.5)	(24.0)	(819.4)	(84.1)
Property, Plant and Equipment, Net	(419.3)	(413.8)	(462.9)	(419.3)	(462.9)
Operating Segments [Member] | Jackups
Segment Reporting Information [Line Items]
Revenues	59.8	128.5	185.8	232.4	366.5
Operating expenses
Contract drilling (exclusive of depreciation)	53.8	95.4	142.2	175.0	281.4
Loss on impairment			0.0	0.0	0.0
Depreciation expense	17.3	7.8	8.7	69.7	17.8
General and Administrative Expense	0.0	0.0	0.0	0.0	0.0
Equity in earnings of ARO	0.0	0.0	0.0	0.0	0.0
Operating Income (Loss)	(11.3)	25.3	34.9	(12.3)	67.3
Property, Plant and Equipment, Net	(401.4)	(396.2)	(384.8)	(401.4)	(384.8)
Operating Segments [Member] | ARO
Segment Reporting Information [Line Items]
Revenues	40.8	84.0	116.4	163.5	227.7
Operating expenses
Contract drilling (exclusive of depreciation)	29.8	62.9	82.1	116.1	166.3
Loss on impairment			0.0	0.0	0.0
Depreciation expense	4.9	9.7	15.4	21.0	31.9
General and Administrative Expense	1.2	3.1	3.2	4.2	8.4
Equity in earnings of ARO	0.0	0.0	0.0	0.0	0.0
Operating Income (Loss)	4.9	8.3	15.7	22.2	21.1
Property, Plant and Equipment, Net	(730.7)	(730.0)	(733.4)	(730.7)	(733.4)
Operating Segments [Member] | Other
Segment Reporting Information [Line Items]
Revenues	12.1	24.6	39.4	49.3	77.4
Operating expenses
Contract drilling (exclusive of depreciation)	4.7	9.2	24.7	19.9	40.2
Loss on impairment			0.0	0.0	0.0
Depreciation expense	3.5	0.8	1.3	14.8	2.2
General and Administrative Expense	0.0	0.0	0.0	0.0	0.0
Equity in earnings of ARO	0.0	0.0	0.0	0.0	0.0
Operating Income (Loss)	3.9	14.6	13.4	14.6	35.0
Property, Plant and Equipment, Net	(50.5)	(49.8)	(50.4)	(50.5)	(50.4)
Corporate, Non-Segment [Member] | Reconciling Items
Segment Reporting Information [Line Items]
Revenues	(40.8)	(84.0)	(116.4)	(163.5)	(227.7)
Operating expenses
Contract drilling (exclusive of depreciation)	(19.5)	(44.2)	(52.5)	(73.7)	(107.7)
Loss on impairment			0.0	0.0	0.0
Depreciation expense	(4.1)	(9.6)	(15.4)	(18.0)	(31.6)
General and Administrative Expense	5.2	9.6	15.8	26.5	29.4
Equity in earnings of ARO	(1.2)	(4.8)	(8.7)	(3.1)	(13.0)
Operating Income (Loss)	(21.2)	(35.0)	(55.6)	(95.2)	(104.8)
Property, Plant and Equipment, Net	$ 692.8	$ 692.0	$ 699.8	$ 692.8	$ 699.8

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