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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