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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 548,200,000 | $ 1,012,200,000 | $ 2,271,800,000 | $ 3,235,100,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 298,100,000 | 433,500,000 | 1,012,000,000 | 1,454,400,000 |
Loss on impairment | 0 | 2,400,000 | 0 | 2,400,000 |
Depreciation | 109,400,000 | 145,200,000 | 335,100,000 | 422,800,000 |
General and administrative | 25,300,000 | 28,400,000 | 76,100,000 | 88,200,000 |
OPERATING INCOME | 115,400,000 | 402,700,000 | 848,600,000 | 1,267,300,000 |
Property and equipment, net | 10,959,700,000 | 13,528,900,000 | 10,959,700,000 | 13,528,900,000 | $ 11,087,800,000
Operating Segments [Member] | Floaters [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 319,300,000 | 646,400,000 | 1,468,300,000 | 1,975,700,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 153,700,000 | 242,400,000 | 573,600,000 | 813,600,000 |
Loss on impairment |  | 0 |  | 0 |
Depreciation | 72,900,000 | 95,700,000 | 231,000,000 | 283,100,000 |
General and administrative | 0 | 0 | 0 | 0 |
OPERATING INCOME | 92,700,000 | 308,300,000 | 663,700,000 | 879,000,000 |
Property and equipment, net | 8,360,400,000 | 10,260,500,000 | 8,360,400,000 | 10,260,500,000 |
Operating Segments [Member] | Jackup [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 213,800,000 | 325,800,000 | 743,000,000 | 1,138,200,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 133,200,000 | 160,000,000 | 390,000,000 | 544,200,000 |
Loss on impairment |  | 2,400,000 |  | 2,400,000 |
Depreciation | 32,100,000 | 44,800,000 | 90,800,000 | 129,900,000 |
General and administrative | 0 | 0 | 0 |  |
OPERATING INCOME | 48,500,000 | 118,600,000 | 262,200,000 | 461,700,000 |
Property and equipment, net | 2,537,900,000 | 3,194,600,000 | 2,537,900,000 | 3,194,600,000 |
Operating Segments [Member] | Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 15,100,000 | 40,000,000 | 60,500,000 | 121,200,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 11,200,000 | 31,100,000 | 48,400,000 | 96,600,000 |
Loss on impairment |  | 0 |  | 0 |
Depreciation | 0 | 0 | 0 | 0 |
General and administrative | 0 | 0 | 0 | 0 |
OPERATING INCOME | 3,900,000 | 8,900,000 | 12,100,000 | 24,600,000 |
Property and equipment, net | 0 | 0 | 0 | 0 |
Operating Segments [Member] | Operating Segments Total [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 548,200,000 | 1,012,200,000 | 2,271,800,000 | 3,235,100,000 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 298,100,000 | 433,500,000 | 1,012,000,000 | 1,454,400,000 |
Loss on impairment |  | 2,400,000 |  | 2,400,000 |
Depreciation | 105,000,000 | 140,500,000 | 321,800,000 | 413,000,000 |
General and administrative | 0 | 0 | 0 | 0 |
OPERATING INCOME | 145,100,000 | 435,800,000 | 938,000,000 | 1,365,300,000 |
Property and equipment, net | 10,898,300,000 | 13,455,100,000 | 10,898,300,000 | 13,455,100,000 |
Corporate, Non-Segment [Member] | 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 |  | 0 |
Depreciation | 4,400,000 | 4,700,000 | 13,300,000 | 9,800,000 |
General and administrative | 25,300,000 | 28,400,000 | 76,100,000 | 88,200,000 |
OPERATING INCOME | (29,700,000) | (33,100,000) | (89,400,000) | (98,000,000) |
Property and equipment, net | $ 61,400,000 | $ 73,800,000 | $ 61,400,000 | $ 73,800,000 |

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