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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, 2020	Apr. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 90.3	$ 202.8	$ 388.8	$ 397.4	$ 845.4
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	85.6	168.7	370.7	337.8	846.7
Loss on impairment	0.0	0.0	838.0	756.5	3,646.2
Depreciation expense	37.5	16.6	131.5	159.6	296.0
General and administrative	6.4	12.7	62.6	30.7	116.0
Equity in losses (earnings) of ARO	(1.2)	(4.8)	5.2	(3.1)	11.5
Operating Income (Loss)	(38.0)	9.6	(1,019.2)	(884.1)	(4,071.0)
Property, Plant and Equipment, Net	(909.1)	(897.8)	(11,192.6)	(909.1)	(11,192.6)	$ (10,960.5)
Operating Segments [Member] | Floaters
Segment Reporting Information [Line Items]
Revenues	18.4	49.7	163.6	115.7	343.2
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	21.7	45.2	150.5	106.0	339.3
Loss on impairment			831.9	756.5	3,386.2
Depreciation expense	15.9	7.9	62.0	72.1	151.4
General and administrative	0.0	0.0	0.0	0.0	0.0
Equity in losses (earnings) of ARO	0.0	0.0	0.0	0.0	0.0
Operating Income (Loss)	(19.2)	(3.4)	(880.8)	(818.9)	(3,533.7)
Property, Plant and Equipment, Net	(419.3)	(413.8)	(6,536.9)	(419.3)	(6,536.9)
Operating Segments [Member] | Jackups
Segment Reporting Information [Line Items]
Revenues	59.8	128.5	186.3	232.4	399.1
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	48.8	95.5	163.5	169.3	370.1
Loss on impairment			0.4	0.0	254.3
Depreciation expense	17.3	7.8	52.8	69.7	111.3
General and administrative	0.0	0.0	0.0	0.0	0.0
Equity in losses (earnings) of ARO	0.0	0.0	0.0	0.0	0.0
Operating Income (Loss)	(6.3)	25.2	(30.4)	(6.6)	(336.6)
Property, Plant and Equipment, Net	(401.4)	(396.2)	(4,000.6)	(401.4)	(4,000.6)
Operating Segments [Member] | ARO
Segment Reporting Information [Line Items]
Revenues	40.8	84.0	146.0	163.5	286.3
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	29.8	62.9	112.5	116.1	220.8
Loss on impairment			0.0	0.0	0.0
Depreciation expense	4.9	9.7	13.3	21.0	26.3
General and administrative	1.2	3.1	7.1	4.2	15.4
Equity in losses (earnings) of ARO	0.0	0.0	0.0	0.0	0.0
Operating Income (Loss)	4.9	8.3	13.1	22.2	23.8
Property, Plant and Equipment, Net	(730.7)	(730.0)	(739.7)	(730.7)	(739.7)
Operating Segments [Member] | Other
Segment Reporting Information [Line Items]
Revenues	12.1	24.6	38.9	49.3	103.1
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	4.7	9.2	15.3	19.8	49.4
Loss on impairment			5.7	0.0	5.7
Depreciation expense	3.5	0.8	11.2	14.8	22.3
General and administrative	0.0	0.0	0.0	0.0	0.0
Equity in losses (earnings) of ARO	0.0	0.0	0.0	0.0	0.0
Operating Income (Loss)	3.9	14.6	6.7	14.7	25.7
Property, Plant and Equipment, Net	(50.5)	(49.8)	(600.4)	(50.5)	(600.4)
Corporate, Non-Segment [Member] | Reconciling Items
Segment Reporting Information [Line Items]
Revenues	(40.8)	(84.0)	(146.0)	(163.5)	(286.3)
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	(19.4)	(44.1)	(71.1)	(73.4)	(132.9)
Loss on impairment			0.0	0.0	0.0
Depreciation expense	(4.1)	(9.6)	(7.8)	(18.0)	(15.3)
General and administrative	5.2	9.6	55.5	26.5	100.6
Equity in losses (earnings) of ARO	(1.2)	(4.8)	5.2	(3.1)	11.5
Operating Income (Loss)	(21.3)	(35.1)	(127.8)	(95.5)	(250.2)
Property, Plant and Equipment, Net	$ 692.8	$ 692.0	$ 685.0	$ 692.8	$ 685.0

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