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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 285.3	$ 551.3	$ 1,130.7	$ 1,541.1
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	307.2	496.5	1,153.9	1,329.4
Asset Impairment Charges	0.0	88.2	3,646.2	90.7
Depreciation expense	122.4	163.0	418.4	445.9
General and administrative	72.1	36.1	188.1	146.9
OTHER OPERATING INCOME	118.1	0.0	118.1	0.0
Equity in earnings of ARO	(3.9)	3.7	7.6	3.1
OPERATING LOSS	(94.4)	(236.2)	(4,165.4)	(474.9)
Property and equipment, net	11,082.4	15,250.7	11,082.4	15,250.7	$ 15,096.9
Operating Segments [Member] | Floaters
Segment Reporting Information [Line Items]
Revenues	57.1	269.8	400.3	798.1
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	128.5	250.3	513.2	681.3
Asset Impairment Charges	0.0	88.2	3,386.2	88.2
Depreciation expense	55.8	92.7	207.2	271.4
General and administrative	0.0	0.0	0.0	0.0
OTHER OPERATING INCOME	118.1		118.1
Equity in earnings of ARO	0.0	0.0	0.0	0.0
OPERATING LOSS	(9.1)	(161.4)	(3,588.2)	(242.8)
Property and equipment, net	6,465.9	10,187.5	6,465.9	10,187.5
Operating Segments [Member] | Jackups
Segment Reporting Information [Line Items]
Revenues	186.8	217.8	585.9	604.0
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	160.2	213.5	569.0	561.1
Asset Impairment Charges	0.0	0.0	254.3	0.0
Depreciation expense	52.9	55.9	164.2	146.0
General and administrative	0.0	0.0	0.0	0.0
OTHER OPERATING INCOME	0.0		0.0
Equity in earnings of ARO	0.0	0.0	0.0	0.0
OPERATING LOSS	(26.3)	(51.6)	(401.6)	(103.1)
Property and equipment, net	3,961.0	5,022.0	3,961.0	5,022.0
Operating Segments [Member] | ARO
Segment Reporting Information [Line Items]
Revenues	145.6	138.4	431.9	262.2
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	99.0	92.7	319.8	171.7
Asset Impairment Charges	0.0	0.0	0.0	0.0
Depreciation expense	14.8	14.6	41.1	26.9
General and administrative	5.8	8.8	21.2	13.9
OTHER OPERATING INCOME	0.0		0.0
Equity in earnings of ARO	0.0	0.0	0.0	0.0
OPERATING LOSS	26.0	22.3	49.8	49.7
Property and equipment, net	736.3	652.5	736.3	652.5
Operating Segments [Member] | Other
Segment Reporting Information [Line Items]
Revenues	41.4	63.7	144.5	139.0
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	18.5	32.7	71.7	87.0
Asset Impairment Charges	0.0	0.0	5.7	0.0
Depreciation expense	11.3	8.5	33.6	15.3
General and administrative	0.0	0.0	0.0	0.0
OTHER OPERATING INCOME	0.0		0.0
Equity in earnings of ARO	0.0	0.0	0.0	0.0
OPERATING LOSS	11.6	22.5	33.5	36.7
Property and equipment, net	655.5	0.0	655.5	0.0
Corporate, Non-Segment [Member] | Reconciling Items
Segment Reporting Information [Line Items]
Revenues	(145.6)	(138.4)	(431.9)	(262.2)
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	(99.0)	(92.7)	(319.8)	(171.7)
Asset Impairment Charges	0.0	0.0	0.0	2.5
Depreciation expense	(12.4)	(8.7)	(27.7)	(13.7)
General and administrative	66.3	27.3	166.9	133.0
OTHER OPERATING INCOME	0.0		0.0
Equity in earnings of ARO	(3.9)	3.7	7.6	3.1
OPERATING LOSS	(96.6)	(68.0)	(258.9)	(215.4)
Property and equipment, net	$ (736.3)	$ (611.3)	$ (736.3)	$ (611.3)

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