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Property And Equipment (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Jun. 30, 2022 | Mar. 31, 2021 | Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Loss on impairment |  | $ 34.5 | $ 5.6 | $ 756.5 | $ 0.0 | $ 0.0 | $ 34.5
PROPERTY AND EQUIPMENT, AT COST |  |  |  |  |  | 1,889.0 | 1,134.5
V54 | Operating Segments [Member] | Jackups Member |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  | $ 27.3 |
V113 & V114 | Operating Segments [Member] | Jackups Member |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  |  | 130.5
V100 | Jackups Member |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  |  | 3.2
V68 | Jackups Member |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  |  | $ 7.0
V22, V37, V100 and V142 | Jackups Member |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  | $ 20.7 |  |
V101 | Jackups Member |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets | $ 5.3 |  |  |  |  |  |
Floaters [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Loss on impairment |  |  | 756.5 |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  | $ 26.0 |  |  |  |

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