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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 471,100,000 | $ 814,000,000 |
Operating Expenses [Abstract] |  |  |
Contract drilling (exclusive of depreciation) | 278,100,000 | 363,700,000 |
Depreciation | 109,200,000 | 113,300,000 |
General and administrative | 26,000,000 | 23,400,000 |
OPERATING (LOSS) INCOME | 57,800,000 | 313,600,000 |
Property and equipment, net | 11,120,700,000 | 11,097,100,000 | $ 10,919,300,000
Floaters [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 284,800,000 | 512,600,000 |
Operating Expenses [Abstract] |  |  |
Contract drilling (exclusive of depreciation) | 146,400,000 | 211,300,000 |
Depreciation | 72,800,000 | 80,300,000 |
General and administrative | 0 | 0 |
OPERATING (LOSS) INCOME | 65,600,000 | 221,000,000 |
Property and equipment, net | 8,534,300,000 | 8,480,600,000 |
Jackups Member |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 171,800,000 | 277,900,000 |
Operating Expenses [Abstract] |  |  |
Contract drilling (exclusive of depreciation) | 118,600,000 | 134,500,000 |
Depreciation | 32,100,000 | 28,600,000 |
General and administrative | 0 | 0 |
OPERATING (LOSS) INCOME | 21,100,000 | 114,800,000 |
Property and equipment, net | 2,532,400,000 | 2,549,800,000 |
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 14,500,000 | 23,500,000 |
Operating Expenses [Abstract] |  |  |
Contract drilling (exclusive of depreciation) | 13,100,000 | 17,900,000 |
Depreciation | 0 | 0 |
General and administrative | 0 | 0 |
OPERATING (LOSS) INCOME | 1,400,000 | 5,600,000 |
Property and equipment, net | 0 | 0 |
Operating Segments Total [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 471,100,000 | 814,000,000 |
Operating Expenses [Abstract] |  |  |
Contract drilling (exclusive of depreciation) | 278,100,000 | 363,700,000 |
Depreciation | 104,900,000 | 108,900,000 |
General and administrative | 0 | 0 |
OPERATING (LOSS) INCOME | 88,100,000 | 341,400,000 |
Property and equipment, net | 11,066,700,000 | 11,030,400,000 |
Reconciling Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 0 | 0 |
Operating Expenses [Abstract] |  |  |
Contract drilling (exclusive of depreciation) | 0 | 0 |
Depreciation | 4,300,000 | 4,400,000 |
General and administrative | 26,000,000 | 23,400,000 |
OPERATING (LOSS) INCOME | (30,300,000) | (27,800,000) |
Property and equipment, net | $ 54,000,000 | $ 66,700,000 |

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