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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 460.2 | $ 548.2 | $ 1,388.8 | $ 2,271.8 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 285.8 | 298.1 | 855.2 | 1,012.0 |
Depreciation | 108.2 | 109.4 | 325.3 | 335.1 |
General and administrative | 30.4 | 25.3 | 86.9 | 76.1 |
OPERATING INCOME | 35.8 | 115.4 | 121.4 | 848.6 |
Property and equipment, net | 11,096.4 | 10,959.7 | 11,096.4 | 10,959.7 | $ 10,919.3
Floaters |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 291.9 | 319.3 | 840.7 | 1,468.3 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 139.1 | 153.7 | 431.1 | 573.6 |
Depreciation | 72.7 | 72.9 | 217.5 | 231.0 |
General and administrative | 0.0 | 0.0 | 0.0 | 0.0 |
OPERATING INCOME | 80.1 | 92.7 | 192.1 | 663.7 |
Property and equipment, net | 8,545.5 | 8,360.4 | 8,545.5 | 8,360.4 |
Jackups |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 153.1 | 213.8 | 503.8 | 743.0 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 132.9 | 133.2 | 383.8 | 390.0 |
Depreciation | 31.6 | 32.1 | 95.3 | 90.8 |
General and administrative | 0.0 | 0.0 | 0.0 | 0.0 |
OPERATING INCOME | (11.4) | 48.5 | 24.7 | 262.2 |
Property and equipment, net | 2,502.4 | 2,537.9 | 2,502.4 | 2,537.9 |
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 15.2 | 15.1 | 44.3 | 60.5 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 13.8 | 11.2 | 40.3 | 48.4 |
Depreciation | 0.0 | 0.0 | 0.0 | 0.0 |
General and administrative | 0.0 | 0.0 | 0.0 | 0.0 |
OPERATING INCOME | 1.4 | 3.9 | 4.0 | 12.1 |
Property and equipment, net | 0.0 | 0.0 | 0.0 | 0.0 |
Operating Segments Total |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 460.2 | 548.2 | 1,388.8 | 2,271.8 |
Operating Expenses [Abstract] |  |  |  |  |
Contract drilling (exclusive of depreciation) | 285.8 | 298.1 | 855.2 | 1,012.0 |
Depreciation | 104.3 | 105.0 | 312.8 | 321.8 |
General and administrative | 0.0 | 0.0 | 0.0 | 0.0 |
OPERATING INCOME | 70.1 | 145.1 | 220.8 | 938.0 |
Property and equipment, net | 11,047.9 | 10,898.3 | 11,047.9 | 10,898.3 |
Reconciling Items |  |  |  |  |
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 | 3.9 | 4.4 | 12.5 | 13.3 |
General and administrative | 30.4 | 25.3 | 86.9 | 76.1 |
OPERATING INCOME | (34.3) | (29.7) | (99.4) | (89.4) |
Property and equipment, net | $ 48.5 | $ 61.4 | $ 48.5 | $ 61.4 |

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