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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 457.5 | $ 909.6 | $ 928.6 | $ 1,723.6 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 291.3 | 350.2 | 569.4 | 713.9 |
Depreciation | 107.9 | 112.4 | 217.1 | 225.7 |
General and administrative | 30.5 | 27.4 | 56.5 | 50.8 |
OPERATING INCOME | 27.8 | 419.6 | 85.6 | 733.2 |
Property and equipment, net | 11,059.0 | 11,021.2 | 11,059.0 | 11,021.2 | $ 10,919.3
Floaters [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 264.0 | 636.4 | 548.8 | 1,149.0 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 145.6 | 208.6 | 292.0 | 419.9 |
Depreciation | 72.0 | 77.8 | 144.8 | 158.1 |
General and administrative | 0.0 | 0.0 | 0.0 | 0.0 |
OPERATING INCOME | 46.4 | 350.0 | 112.0 | 571.0 |
Property and equipment, net | 8,493.2 | 8,414.1 | 8,493.2 | 8,414.1 |
Jackup [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 178.9 | 251.3 | 350.7 | 529.2 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 132.3 | 122.3 | 250.9 | 256.8 |
Depreciation | 31.6 | 30.1 | 63.7 | 58.7 |
General and administrative | 0.0 | 0.0 | 0.0 | 0.0 |
OPERATING INCOME | 15.0 | 98.9 | 36.1 | 213.7 |
Property and equipment, net | 2,515.3 | 2,543.0 | 2,515.3 | 2,543.0 |
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 14.6 | 21.9 | 29.1 | 45.4 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 13.4 | 19.3 | 26.5 | 37.2 |
Depreciation | 0.0 | 0.0 | 0.0 | 0.0 |
General and administrative | 0.0 | 0.0 | 0.0 | 0.0 |
OPERATING INCOME | 1.2 | 2.6 | 2.6 | 8.2 |
Property and equipment, net | 0.0 | 0.0 | 0.0 | 0.0 |
Operating Segments Total [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 457.5 | 909.6 | 928.6 | 1,723.6 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 291.3 | 350.2 | 569.4 | 713.9 |
Depreciation | 103.6 | 107.9 | 208.5 | 216.8 |
General and administrative | 0.0 | 0.0 | 0.0 | 0.0 |
OPERATING INCOME | 62.6 | 451.5 | 150.7 | 792.9 |
Property and equipment, net | 11,008.5 | 10,957.1 | 11,008.5 | 10,957.1 |
Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 0.0 | 0.0 | 0.0 | 0.0 |
Depreciation | 4.3 | 4.5 | 8.6 | 8.9 |
General and administrative | 30.5 | 27.4 | 56.5 | 50.8 |
OPERATING INCOME | (34.8) | (31.9) | (65.1) | (59.7) |
Property and equipment, net | $ 50.5 | $ 64.1 | $ 50.5 | $ 64.1 |

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