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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended			4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2022	Dec. 31, 2021
Capitalized Contract Cost [Line Items]
Early termination fee received						$ 51.0
Loss on impairment		$ 34.5		$ 756.5	$ 0.0	34.5
Capitalized Contract Cost, Net	$ 82.4					$ 82.4
Contract With Customers, Invoice Term						30 days
Upfront Rig Mobilizations And Certain Contract Preparation [Member]
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net	69.8					$ 69.8	$ 31.4
Capitalized Contract Cost, Amortization	18.8		$ 11.4	7.6	13.2	41.0
Deferred Certification Costs
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net	12.6					12.6	$ 3.3
Capitalized Contract Cost, Amortization	$ 1.4		$ 0.1	$ 3.1	$ 0.2	$ 2.5
Minimum
Capitalized Contract Cost [Line Items]
Remaining duration of drilling contracts						1 month
Maximum
Capitalized Contract Cost [Line Items]
Remaining duration of drilling contracts						4 years

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
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-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)
-URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 340
-SubTopic 40
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- Definition

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- Definition

Drilling Contracts, Term

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- Definition

Early Termination Fee Received

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