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Property And Equipment (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2026	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Loss on impairment			$ 0.0	$ 0.0	$ 34.5
PROPERTY AND EQUIPMENT, AT COST			2,309.4	1,889.0
Net proceeds from disposition of assets			2.8	30.3	150.3
Net proceeds from disposition of assets			$ 2.8	30.3	150.3
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 | Operating Segments [Member] | Jackups Member
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Other Assets					3.2
V68 | Operating Segments [Member] | Jackups Member
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Other Assets					7.0
V75 | Operating Segments [Member] | Jackups Member | Subsequent Event
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Other Assets	$ 23.0
Net proceeds from disposition of assets	14.0	$ 10.0
Net proceeds from disposition of assets	$ 14.0	$ 10.0
Floaters [Member]
Property, Plant and Equipment [Line Items]
Loss on impairment					$ 34.5

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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