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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 583,900,000 | $ 458,500,000 | $ 989,800,000 | $ 875,500,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 500,300,000 | 344,300,000 | 832,900,000 | 669,500,000 |
Asset Impairment Charges | 2,500,000 | 0 | 2,500,000 | 0 |
Depreciation expense | 157,900,000 | 120,700,000 | 282,900,000 | 235,900,000 |
General and administrative | 81,200,000 | 26,100,000 | 110,800,000 | 54,000,000.0 |
Income (Loss) from Equity Method Investments | (600,000) | 0 | (600,000) | 0 |
OPERATING LOSS | (157,400,000) | (32,600,000) | (238,700,000) | (83,900,000) |
Property and equipment, net | 15,455,700,000 | 12,783,900,000 | 15,455,700,000 | 12,783,900,000 | $ 12,616,200,000
Floaters |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 295,600,000 | 284,900,000 | 528,300,000 | 543,900,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 249,200,000 | 203,700,000 | 431,000,000.0 | 388,800,000 |
Depreciation expense | 98,400,000 | 80,800,000 | 183,200,000 | 156,100,000 |
General and administrative | 0 | 0 | 0 | 0 |
OPERATING LOSS | (52,000,000.0) | 400,000 | (85,900,000) | (1,000,000.0) |
Property and equipment, net | 10,364,700,000 | 9,574,900,000 | 10,364,700,000 | 9,574,900,000 |
Jackups |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 229,200,000 | 158,700,000 | 386,200,000 | 302,100,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 212,200,000 | 126,800,000 | 347,600,000 | 253,700,000 |
Depreciation expense | 55,500,000 | 36,500,000 | 92,400,000 | 73,000,000.0 |
General and administrative | 0 | 0 | 0 | 0 |
OPERATING LOSS | (38,500,000) | (4,600,000) | (53,800,000) | (24,600,000) |
Property and equipment, net | 5,055,600,000 | 3,167,000,000.0 | 5,055,600,000 | 3,167,000,000.0 |
ARO |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 123,800,000 |  | 123,800,000 |  |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 78,900,000 |  | 78,900,000 |  |
Depreciation expense | 12,400,000 |  | 12,400,000 |  |
General and administrative | 5,300,000 |  | 5,300,000 |  |
OPERATING LOSS | 27,200,000 |  | 27,200,000 |  |
Property and equipment, net | 656,500,000 |  | 656,500,000 |  |
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 59,100,000 | 14,900,000 | 75,300,000 | 29,500,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 38,900,000 | 13,800,000 | 54,300,000 | 27,000,000.0 |
Depreciation expense | 0 | 0 | 0 | 0 |
General and administrative | 0 | 0 | 0 | 0 |
OPERATING LOSS | 20,200,000 | 1,100,000 | 21,000,000.0 | 2,500,000 |
Property and equipment, net | 0 | 0 | 0 | 0 |
Reconciling Items |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (123,800,000) | 0 | (123,800,000) | 0 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | (78,900,000) | 0 | (78,900,000) | 0 |
Asset Impairment Charges | 2,500,000 |  |  |  |
Depreciation expense | (8,400,000) | 3,400,000 | (5,100,000) | 6,800,000 |
General and administrative | 75,900,000 | 26,100,000 | 105,500,000 | 54,000,000.0 |
Income (Loss) from Equity Method Investments | (600,000) |  | (600,000) |  |
OPERATING LOSS | (114,300,000) | (29,500,000) | (147,200,000) | (60,800,000) |
Property and equipment, net | $ (621,100,000) | $ 42,000,000.0 | $ (621,100,000) | $ 42,000,000.0 |

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