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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 1,012,200,000 | $ 1,201,400,000 | $ 3,235,100,000 | $ 3,404,700,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 433,500,000 | 500,200,000 | 1,454,400,000 | 1,562,900,000 |
Loss on impairment | 2,400,000 | 0 | 2,400,000 | 703,500,000 |
Depreciation | 145,200,000 | 135,200,000 | 422,800,000 | 398,500,000 |
General and administrative | 28,400,000 | 29,300,000 | 88,200,000 | 103,600,000 |
OPERATING (LOSS) INCOME | 402,700,000 | 536,700,000 | 1,267,300,000 | 636,200,000 |
Property and equipment, net | 13,528,900,000 | 13,127,600,000 | 13,528,900,000 | 13,127,600,000 | $ 12,534,800,000
Floaters [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 646,400,000 | 703,500,000 | 1,975,700,000 | 2,034,600,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 242,400,000 | 291,300,000 | 813,600,000 | 907,800,000 |
Loss on impairment |  |  |  | 703,500,000 |
Depreciation | 95,700,000 | 87,900,000 | $ 283,100,000 | 266,900,000 |
General and administrative | 0 | 0 |  | 0 |
OPERATING (LOSS) INCOME | 308,300,000 | 324,300,000 | $ 879,000,000 | 156,400,000 |
Property and equipment, net | 10,260,500,000 | 9,836,200,000 | 10,260,500,000 | 9,836,200,000 |
Jackup [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 325,800,000 | 481,000,000 | 1,138,200,000 | 1,320,100,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 160,000,000 | 197,900,000 | 544,200,000 | 621,100,000 |
Loss on impairment | 2,400,000 |  | 2,400,000 | 0 |
Depreciation | 44,800,000 | 45,300,000 | $ 129,900,000 | 125,600,000 |
General and administrative | 0 | 0 |  | 0 |
OPERATING (LOSS) INCOME | 118,600,000 | 237,800,000 | $ 461,700,000 | 573,400,000 |
Property and equipment, net | 3,194,600,000 | 3,215,300,000 | 3,194,600,000 | 3,215,300,000 |
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 40,000,000 | 16,900,000 | 121,200,000 | 50,000,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 31,100,000 | 11,000,000 | 96,600,000 | 34,000,000 |
Loss on impairment |  |  |  | 0 |
Depreciation | 0 | 0 | 0 | 0 |
General and administrative | 0 | 0 | 0 | 0 |
OPERATING (LOSS) INCOME | 8,900,000 | 5,900,000 | 24,600,000 | 16,000,000 |
Property and equipment, net | 0 | 0 | 0 | 0 |
Operating Segments Total [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 1,012,200,000 | 1,201,400,000 | 3,235,100,000 | 3,404,700,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 433,500,000 | 500,200,000 | 1,454,400,000 | 1,562,900,000 |
Loss on impairment | 2,400,000 |  | 2,400,000 | 703,500,000 |
Depreciation | 140,500,000 | 133,200,000 | 413,000,000 | 392,500,000 |
General and administrative | 0 | 0 | 0 | 0 |
OPERATING (LOSS) INCOME | 435,800,000 | 568,000,000 | 1,365,300,000 | 745,800,000 |
Property and equipment, net | 13,455,100,000 | 13,051,500,000 | 13,455,100,000 | 13,051,500,000 |
Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 0 | 0 | 0 | 0 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 0 | 0 | 0 | 0 |
Loss on impairment |  |  |  | 0 |
Depreciation | 4,700,000 | 2,000,000 | 9,800,000 | 6,000,000 |
General and administrative | 28,400,000 | 29,300,000 | 88,200,000 | 103,600,000 |
OPERATING (LOSS) INCOME | (33,100,000) | (31,300,000) | (98,000,000) | (109,600,000) |
Property and equipment, net | $ 73,800,000 | $ 76,100,000 | $ 73,800,000 | $ 76,100,000 |

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