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Segment Information (Schedule Of Segment Reporting Information) (Details) (USD $)
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3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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| Segment Reporting Information [Line Items] | |||||
| Revenues | $ 1,203,000,000 | $ 1,130,300,000 | $ 2,332,900,000 | $ 2,170,600,000 | |
| Operating Expenses [Abstract] | |||||
| Contract drilling (exclusive of depreciation) | 576,000,000 | 527,200,000 | 1,128,600,000 | 1,007,000,000 | |
| Asset Impairment Charges | 991,500,000 | 0 | 991,500,000 | 0 | |
| Depreciation | 139,400,000 | 132,000,000 | 278,600,000 | 259,900,000 | |
| General and administrative | 36,200,000 | 36,400,000 | 74,300,000 | 74,200,000 | |
| OPERATING (LOSS) INCOME | (540,100,000) | 434,700,000 | (140,100,000) | 829,500,000 | |
| Property and equipment, net | 12,881,200,000 | 13,390,500,000 | 12,881,200,000 | 13,390,500,000 | 14,311,000,000 |
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Floaters [Member]
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| Segment Reporting Information [Line Items] | |||||
| Revenues | 720,600,000 | 716,900,000 | 1,410,800,000 | 1,342,200,000 | |
| Operating Expenses [Abstract] | |||||
| Contract drilling (exclusive of depreciation) | 330,300,000 | 302,600,000 | 656,400,000 | 573,200,000 | |
| Asset Impairment Charges | 991,500,000 | 991,500,000 | |||
| Depreciation | 93,200,000 | 91,700,000 | 189,600,000 | 179,400,000 | |
| General and administrative | 0 | 0 | 0 | 0 | |
| OPERATING (LOSS) INCOME | (694,400,000) | 322,600,000 | (426,700,000) | 589,600,000 | |
| Property and equipment, net | 9,661,100,000 | 10,862,500,000 | 9,661,100,000 | 10,862,500,000 | |
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Jackup [Member]
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|||||
| Segment Reporting Information [Line Items] | |||||
| Revenues | 465,900,000 | 393,100,000 | 889,000,000 | 787,900,000 | |
| Operating Expenses [Abstract] | |||||
| Contract drilling (exclusive of depreciation) | 234,000,000 | 208,600,000 | 449,200,000 | 402,100,000 | |
| Asset Impairment Charges | 0 | 0 | |||
| Depreciation | 44,100,000 | 38,700,000 | 85,000,000 | 77,300,000 | |
| General and administrative | 0 | 0 | 0 | 0 | |
| OPERATING (LOSS) INCOME | 187,800,000 | 145,800,000 | 354,800,000 | 308,500,000 | |
| Property and equipment, net | 3,152,900,000 | 2,491,200,000 | 3,152,900,000 | 2,491,200,000 | |
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Other [Member]
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| Segment Reporting Information [Line Items] | |||||
| Revenues | 16,500,000 | 20,300,000 | 33,100,000 | 40,500,000 | |
| Operating Expenses [Abstract] | |||||
| Contract drilling (exclusive of depreciation) | 11,700,000 | 16,000,000 | 23,000,000 | 31,700,000 | |
| Asset Impairment Charges | 0 | 0 | |||
| Depreciation | 0 | 0 | 0 | 0 | |
| General and administrative | 0 | 0 | 0 | 0 | |
| OPERATING (LOSS) INCOME | 4,800,000 | 4,300,000 | 10,100,000 | 8,800,000 | |
| Property and equipment, net | 0 | 0 | 0 | 0 | |
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Operating Segments Total [Member]
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| Segment Reporting Information [Line Items] | |||||
| Revenues | 1,203,000,000 | 1,130,300,000 | 2,332,900,000 | 2,170,600,000 | |
| Operating Expenses [Abstract] | |||||
| Contract drilling (exclusive of depreciation) | 576,000,000 | 527,200,000 | 1,128,600,000 | 1,007,000,000 | |
| Asset Impairment Charges | 991,500,000 | 991,500,000 | |||
| Depreciation | 137,300,000 | 130,400,000 | 274,600,000 | 256,700,000 | |
| General and administrative | 0 | 0 | 0 | 0 | |
| OPERATING (LOSS) INCOME | (501,800,000) | 472,700,000 | (61,800,000) | 906,900,000 | |
| Property and equipment, net | 12,814,000,000 | 13,353,700,000 | 12,814,000,000 | 13,353,700,000 | |
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Reconciling Items [Member]
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| Segment Reporting Information [Line Items] | |||||
| Revenues | 0 | 0 | 0 | 0 | |
| Operating Expenses [Abstract] | |||||
| Contract drilling (exclusive of depreciation) | 0 | 0 | 0 | 0 | |
| Asset Impairment Charges | 0 | 0 | |||
| Depreciation | 2,100,000 | 1,600,000 | 4,000,000 | 3,200,000 | |
| General and administrative | 36,200,000 | 36,400,000 | 74,300,000 | 74,200,000 | |
| OPERATING (LOSS) INCOME | (38,300,000) | (38,000,000) | (78,300,000) | (77,400,000) | |
| Property and equipment, net | $ 67,200,000 | $ 36,800,000 | $ 67,200,000 | $ 36,800,000 | |