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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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