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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended			4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 437.2		$ 326.7	$ 397.4	$ 529.5	$ 1,168.9
Operating expenses
Contract drilling (exclusive of depreciation)	336.7		274.6	343.8	443.2	1,029.8
Loss on impairment		$ 34.5		756.5	0.0	34.5
Depreciation expense	22.6		24.4	159.6	41.0	67.4
General and administrative	19.2		27.2	30.7	39.9	57.0
Equity in earnings of ARO	(2.9)		(2.6)	(3.1)	(7.4)	(15.9)
Operating Income (Loss)	61.6		3.1	(890.1)	12.8	(3.9)
Property, Plant and Equipment, Net	(953.6)		(892.3)	(909.1)	(892.3)	(953.6)	$ (890.9)
Operating Segments [Member] | Floaters
Segment Reporting Information [Line Items]
Revenues	201.7		104.3	115.7	154.0	489.5
Operating expenses
Contract drilling (exclusive of depreciation)	160.5		91.6	106.5	136.9	473.4
Loss on impairment				756.5		34.5
Depreciation expense	12.6		11.4	72.1	19.3	37.1
General and administrative	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)	28.6		1.3	(819.4)	(2.2)	(55.5)
Property, Plant and Equipment, Net	(473.4)		(416.2)	(419.3)	(416.2)	(473.4)
Operating Segments [Member] | Jackups
Segment Reporting Information [Line Items]
Revenues	195.9		186.3	232.4	314.8	562.4
Operating expenses
Contract drilling (exclusive of depreciation)	128.0		141.7	175.0	237.1	409.4
Loss on impairment				0.0		0.0
Depreciation expense	8.7		12.1	69.7	19.9	26.5
General and administrative	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)	59.2		32.5	(12.3)	57.8	126.5
Property, Plant and Equipment, Net	(386.7)		(394.2)	(401.4)	(394.2)	(386.7)
Operating Segments [Member] | ARO
Segment Reporting Information [Line Items]
Revenues	111.4		117.7	163.5	201.7	339.1
Operating expenses
Contract drilling (exclusive of depreciation)	90.0		94.4	116.1	157.3	256.3
Loss on impairment				0.0		0.0
Depreciation expense	15.4		16.8	21.0	26.5	47.3
General and administrative	4.7		5.4	4.2	8.5	13.1
Equity in earnings of ARO	0.0		0.0	0.0	0.0	0.0
Operating Income (Loss)	1.3		1.1	22.2	9.4	22.4
Property, Plant and Equipment, Net	(757.7)		(728.3)	(730.7)	(728.3)	(757.7)
Operating Segments [Member] | Other
Segment Reporting Information [Line Items]
Revenues	39.6		36.1	49.3	60.7	117.0
Operating expenses
Contract drilling (exclusive of depreciation)	17.8		14.2	19.9	23.4	58.0
Loss on impairment				0.0		0.0
Depreciation expense	1.2		0.9	14.8	1.7	3.4
General and administrative	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)	20.6		21.0	14.6	35.6	55.6
Property, Plant and Equipment, Net	(57.7)		(47.3)	(50.5)	(47.3)	(57.7)
Corporate, Non-Segment [Member] | Reconciling Items
Segment Reporting Information [Line Items]
Revenues	(111.4)		(117.7)	(163.5)	(201.7)	(339.1)
Operating expenses
Contract drilling (exclusive of depreciation)	(59.6)		(67.3)	(73.7)	(111.5)	(167.3)
Loss on impairment				0.0		0.0
Depreciation expense	(15.3)		(16.8)	(18.0)	(26.4)	(46.9)
General and administrative	14.5		21.8	26.5	31.4	43.9
Equity in earnings of ARO	(2.9)		(2.6)	(3.1)	(7.4)	(15.9)
Operating Income (Loss)	(48.1)		(52.8)	(95.2)	(87.8)	(152.9)
Property, Plant and Equipment, Net	$ 721.9		$ 693.7	$ 692.8	$ 693.7	$ 721.9

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