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Revenue from Contracts with Customers Narrative (Details) - USD ($) $ in Millions	3 Months Ended			4 Months Ended	8 Months Ended	12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Net						$ 73.5
Early Termination Fee Received						51.0
Asset Impairment Charges	$ 34.5	$ 34.5	$ 5.6	$ 756.5	$ 0.0	$ 34.5	$ 3,646.2
Minimum
Disaggregation of Revenue [Line Items]
Drilling Contracts, Term						1 month
Maximum
Disaggregation of Revenue [Line Items]
Drilling Contracts, Term						5 years
Upfront Rig Mobilizations And Certain Contract Preparation [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Net					31.4	$ 57.3
Capitalized Contract Cost, Amortization				7.6	22.0	61.7	42.1
Deferred Certification Costs [Member]
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Net					3.3	16.2
Capitalized Contract Cost, Amortization				$ 3.1	$ 0.7	$ 4.7	$ 8.9

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
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- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

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