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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, 2021	Sep. 30, 2020	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 326.7	$ 285.3	$ 397.4	$ 529.5	$ 1,130.7
Operating expenses
Contract drilling (exclusive of depreciation)	274.3	307.2	337.8	443.0	1,153.9
Loss on impairment			756.5	0.0	3,646.2
Depreciation expense	24.4	122.4	159.6	41.0	418.4
General and administrative	27.2	72.1	30.7	39.9	188.1
OTHER OPERATING INCOME	0.0	118.1	0.0	0.0	118.1
Equity in losses (earnings) of ARO	(2.6)	(3.9)	(3.1)	(7.4)	7.6
Operating Income (Loss)	3.4	(94.4)	(884.1)	13.0	(4,165.4)
Property, Plant and Equipment, Net	(892.3)	(11,082.4)	(909.1)	(892.3)	(11,082.4)	$ (10,960.5)
Operating Segments [Member] | Floaters
Segment Reporting Information [Line Items]
Revenues	104.3	57.1	115.7	154.0	400.3
Operating expenses
Contract drilling (exclusive of depreciation)	90.9	112.1	106.0	136.1	451.4
Loss on impairment			756.5		3,386.2
Depreciation expense	11.4	55.8	72.1	19.3	207.2
General and administrative	0.0	0.0	0.0	0.0	0.0
OTHER OPERATING INCOME		118.1			118.1
Equity in losses (earnings) of ARO	0.0	0.0	0.0	0.0	0.0
Operating Income (Loss)	2.0	7.3	(818.9)	(1.4)	(3,526.4)
Property, Plant and Equipment, Net	(416.2)	(6,465.9)	(419.3)	(416.2)	(6,465.9)
Operating Segments [Member] | Jackups
Segment Reporting Information [Line Items]
Revenues	186.3	186.8	232.4	314.8	585.9
Operating expenses
Contract drilling (exclusive of depreciation)	140.9	140.7	169.3	236.4	510.8
Loss on impairment			0.0		254.3
Depreciation expense	12.1	52.9	69.7	19.9	164.2
General and administrative	0.0	0.0	0.0	0.0	0.0
OTHER OPERATING INCOME		0.0			0.0
Equity in losses (earnings) of ARO	0.0	0.0	0.0	0.0	0.0
Operating Income (Loss)	33.3	(6.8)	(6.6)	58.5	(343.4)
Property, Plant and Equipment, Net	(394.2)	(3,961.0)	(401.4)	(394.2)	(3,961.0)
Operating Segments [Member] | ARO
Segment Reporting Information [Line Items]
Revenues	117.7	145.6	163.5	201.7	431.9
Operating expenses
Contract drilling (exclusive of depreciation)	94.4	99.0	116.1	157.3	319.8
Loss on impairment			0.0		0.0
Depreciation expense	16.8	14.8	21.0	26.5	41.1
General and administrative	5.4	5.8	4.2	8.5	21.2
OTHER OPERATING INCOME		0.0			0.0
Equity in losses (earnings) of ARO	0.0	0.0	0.0	0.0	0.0
Operating Income (Loss)	1.1	26.0	22.2	9.4	49.8
Property, Plant and Equipment, Net	(728.3)	(736.3)	(730.7)	(728.3)	(736.3)
Operating Segments [Member] | Other
Segment Reporting Information [Line Items]
Revenues	36.1	41.4	49.3	60.7	144.5
Operating expenses
Contract drilling (exclusive of depreciation)	14.1	16.4	19.8	23.3	65.8
Loss on impairment			0.0		5.7
Depreciation expense	0.9	11.3	14.8	1.7	33.6
General and administrative	0.0	0.0	0.0	0.0	0.0
OTHER OPERATING INCOME		0.0			0.0
Equity in losses (earnings) of ARO	0.0	0.0	0.0	0.0	0.0
Operating Income (Loss)	21.1	13.7	14.7	35.7	39.4
Property, Plant and Equipment, Net	(47.3)	(589.1)	(50.5)	(47.3)	(589.1)
Corporate, Non-Segment [Member] | Reconciling Items
Segment Reporting Information [Line Items]
Revenues	(117.7)	(145.6)	(163.5)	(201.7)	(431.9)
Operating expenses
Contract drilling (exclusive of depreciation)	(66.0)	(61.0)	(73.4)	(110.1)	(193.9)
Loss on impairment			0.0		0.0
Depreciation expense	(16.8)	(12.4)	(18.0)	(26.4)	(27.7)
General and administrative	21.8	66.3	26.5	31.4	166.9
OTHER OPERATING INCOME		0.0			0.0
Equity in losses (earnings) of ARO	(2.6)	(3.9)	(3.1)	(7.4)	7.6
Operating Income (Loss)	(54.1)	(134.6)	(95.5)	(89.2)	(384.8)
Property, Plant and Equipment, Net	$ 693.7	$ 669.9	$ 692.8	$ 693.7	$ 669.9

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