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Property and Equipment (Narratives) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Property, Plant and Equipment [Line Items] |  |  |  |
Loss on impairment | $ 0.0 | $ 34.5 | $ 0.0 | $ 34.5
Net proceeds from disposition of assets |  |  | 29.1 | 146.5
Operating Segments [Member] | Jackups |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Loss on impairment |  | $ 0.0 |  | 0.0
V54 | Operating Segments [Member] | Jackups |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  | $ 27.3 |
V113, V114 & V36 | Operating Segments [Member] | Jackups |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  | 128.5
V68 | Operating Segments [Member] | Jackups |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net proceeds from disposition of assets |  |  |  | $ 7.0

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