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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 525.0 | $ 430.1 |
Operating expenses |  |  |
Contract drilling (exclusive of depreciation) | 444.8 | 377.2 |
Depreciation expense | 26.8 | 23.3 |
General and administrative | 26.5 | 24.4 |
Equity in earnings of ARO | (2.4) | (3.3) |
Operating Income (Loss) | 29.3 | 8.5 |
Property, Plant and Equipment, Net | (1,732.3) | (1,015.5) | $ (1,633.8)
Operating Segments [Member] | Floaters |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 324.4 | 214.8 |
Operating expenses |  |  |
Contract drilling (exclusive of depreciation) | 253.4 | 174.6 |
Depreciation expense | 13.2 | 13.0 |
General and administrative | 0.0 | 0.0 |
Equity in earnings of ARO | 0.0 | 0.0 |
Operating Income (Loss) | 57.8 | 27.2 |
Property, Plant and Equipment, Net | (1,080.6) | (515.7) |
Operating Segments [Member] | Jackups |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 152.3 | 169.8 |
Operating expenses |  |  |
Contract drilling (exclusive of depreciation) | 133.9 | 148.9 |
Depreciation expense | 10.4 | 9.0 |
General and administrative | 0.0 | 0.0 |
Equity in earnings of ARO | 0.0 | 0.0 |
Operating Income (Loss) | 8.0 | 11.9 |
Property, Plant and Equipment, Net | (493.8) | (404.1) |
Operating Segments [Member] | ARO |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 138.3 | 123.6 |
Operating expenses |  |  |
Contract drilling (exclusive of depreciation) | 98.3 | 90.9 |
Depreciation expense | 19.0 | 15.0 |
General and administrative | 5.8 | 4.6 |
Equity in earnings of ARO | 0.0 | 0.0 |
Operating Income (Loss) | 15.2 | 13.1 |
Property, Plant and Equipment, Net | (1,050.1) | (788.6) |
Operating Segments [Member] | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 48.3 | 45.5 |
Operating expenses |  |  |
Contract drilling (exclusive of depreciation) | 22.2 | 20.2 |
Depreciation expense | 1.3 | 1.3 |
General and administrative | 0.0 | 0.0 |
Equity in earnings of ARO | 0.0 | 0.0 |
Operating Income (Loss) | 24.8 | 24.0 |
Property, Plant and Equipment, Net | (86.5) | (55.6) |
Corporate, Non-Segment [Member] | Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (138.3) | (123.6) |
Operating expenses |  |  |
Contract drilling (exclusive of depreciation) | (63.0) | (57.4) |
Depreciation expense | (17.1) | (15.0) |
General and administrative | 20.7 | 19.8 |
Equity in earnings of ARO | (2.4) | (3.3) |
Operating Income (Loss) | (76.5) | (67.7) |
Property, Plant and Equipment, Net | $ 978.7 | $ 748.5 |

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