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Property and Equipment (Narratives) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$ 0.0	$ 0.0	$ 34.5	$ 0.0	$ 34.5
Net proceeds from disposition of assets				29.2	146.8
Operating Segments [Member] | Jackups
Property, Plant and Equipment [Line Items]
Asset Impairment Charges					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

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482130/360-10-45-4

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Amount of gain (loss) on sale or disposal of other assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
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-Name Accounting Standards Codification
-Section 45
-Paragraph 12
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