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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 456,600,000	$ 405,900,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	476,000,000.0	332,600,000
Asset Impairment Charges	2,808,200,000	0
Depreciation expense	164,500,000	125,000,000.0
General and administrative	53,400,000	29,600,000
Equity in earnings of ARO	6,300,000	0
OPERATING LOSS	(3,051,800,000)	(81,300,000)
Property and equipment, net	12,157,200,000	12,508,900,000	$ 15,096,900,000
Reconciling Items
Operating Expenses [Abstract]
Property and equipment, net	(740,600,000)
Operating Segments [Member] | Floaters
Segment Reporting Information [Line Items]
Revenues	179,600,000	232,700,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	213,900,000	181,800,000
Asset Impairment Charges	2,554,300,000
Depreciation expense	89,400,000	84,800,000
General and administrative	0	0
Equity in earnings of ARO	0
OPERATING LOSS	(2,678,000,000.0)	(33,900,000)
Property and equipment, net	7,442,500,000	9,383,600,000
Operating Segments [Member] | Jackups
Segment Reporting Information [Line Items]
Revenues	212,800,000	157,000,000.0
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	226,100,000	135,400,000
Asset Impairment Charges	253,900,000
Depreciation expense	58,500,000	36,900,000
General and administrative	0	0
Equity in earnings of ARO	0
OPERATING LOSS	(325,700,000)	(15,300,000)
Property and equipment, net	4,036,000,000.0	3,091,700,000
Operating Segments [Member] | ARO
Segment Reporting Information [Line Items]
Revenues	140,300,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	108,300,000
Asset Impairment Charges	0
Depreciation expense	13,000,000.0
General and administrative	8,300,000
Equity in earnings of ARO	0
OPERATING LOSS	10,700,000
Property and equipment, net	740,600,000
Operating Segments [Member] | Other
Segment Reporting Information [Line Items]
Revenues	64,200,000	16,200,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	36,000,000.0	15,400,000
Asset Impairment Charges	0
Depreciation expense	11,100,000	0
General and administrative	0	0
Equity in earnings of ARO	0
OPERATING LOSS	17,100,000	800,000
Property and equipment, net	678,700,000	0
Corporate, Non-Segment [Member] | Reconciling Items
Segment Reporting Information [Line Items]
Revenues	(140,300,000)	0
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	(108,300,000)	0
Asset Impairment Charges	0
Depreciation expense	(7,500,000)	3,300,000
General and administrative	45,100,000	29,600,000
Equity in earnings of ARO	6,300,000
OPERATING LOSS	$ (75,900,000)	(32,900,000)
Property and equipment, net		$ 33,600,000

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