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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Capitalized Contract Cost [Line Items]
EarlyTerminationFeeReceived	$ 51.0
Capitalized Contract Cost, Net		$ 102.8		$ 102.8
Upfront Rig Mobilizations And Certain Contract Preparation [Member]
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net		84.9		84.9		$ 57.3
Capitalized Contract Cost, Amortization		25.0	$ 18.8	62.7	$ 41.0
Deferred Certification Costs
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net		17.9		17.9		$ 16.2
Capitalized Contract Cost, Amortization		$ 3.2	$ 1.4	$ 9.4	$ 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				5 years

X

- 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
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

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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
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

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Drilling Contracts, Term

+ References

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- Definition

Early Termination Fee Received

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