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Property And Equipment (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2026 USD ($) | Apr. 30, 2025 USD ($) | Dec. 31, 2025 USD ($) jackup | Mar. 31, 2025 USD ($) drillship | Dec. 31, 2024 USD ($) | Mar. 31, 2025 USD ($) drillship | Dec. 31, 2025 USD ($) jackup | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2027 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | $ 27.3 | $ 0.0 | $ 0.0 |
PROPERTY AND EQUIPMENT, AT COST |  |  | $ 2,598.3 |  | $ 2,309.4 |  | 2,598.3 | 2,309.4 |  |
Proceeds from disposition of assets |  |  |  |  |  |  | 137.9 | 2.8 | 30.3 |
Proceeds from disposition of assets |  |  |  |  |  |  | $ 137.9 | 2.8 | 30.3 |
Semisubmersible Rigs, Retired | drillship |  |  |  | 3 |  | 3 |  |  |  |
Jackup Rigs, Retired | jackup |  |  | 2 |  |  |  | 2 |  |  |
Angola Office Building |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  |  | $ 4.0 |  |  |
Proceeds from disposition of assets |  |  |  | $ 2.7 | 2.5 | $ 5.2 |  |  |  |
Proceeds from disposition of assets |  |  |  | 2.7 | $ 2.5 | $ 5.2 |  |  |  |
Operating Segments [Member] | Jackups Member |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | 3.7 | 0.0 |  |
Operating Segments [Member] | Floaters [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | 23.6 | $ 0.0 |  |
V54 | Operating Segments [Member] | Jackups Member |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  |  |  |  | $ 27.3 |
V75 | Operating Segments [Member] | Jackups Member |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  |  | 23.0 |  |  |
Proceeds from disposition of assets |  |  |  | 14.0 |  |  |  |  |  |
Proceeds from disposition of assets |  |  |  | $ 14.0 |  |  |  |  |  |
V75 | Operating Segments [Member] | Jackups Member | Subsequent Event |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from disposition of assets | $ 5.0 |  |  |  |  |  |  |  |  | $ 5.0
Proceeds from disposition of assets | $ 5.0 |  |  |  |  |  |  |  |  | $ 5.0
V247 | Operating Segments [Member] | Jackups Member |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  |  | 88.4 |  |  |
Proceeds from disposition of assets |  |  |  |  |  |  | 108.0 |  |  |
Proceeds from disposition of assets |  |  |  |  |  |  | 108.0 |  |  |
DPS-3, DPS-5 & DPS-6 | Operating Segments [Member] | Floaters [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | 7.8 |  |  |
Proceeds from disposition of assets |  | $ 10.0 |  |  |  |  |  |  |  |
Proceeds from disposition of assets |  | $ 10.0 |  |  |  |  |  |  |  |
DPS-1 | Operating Segments [Member] | Floaters [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | 15.8 |  |  |
V102 & V145 | Operating Segments [Member] | Jackups Member |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from disposition of assets |  |  | $ 0.5 |  |  |  |  |  |  |
Proceeds from disposition of assets |  |  | $ 0.5 |  |  |  |  |  |  |
V102 & V145 | Operating Segments [Member] | Jackups Member |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | $ 3.7 |  |  |

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