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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
	Apr. 30, 2021	Jun. 30, 2021	Jun. 30, 2022	Apr. 30, 2021	Jun. 30, 2022	Dec. 31, 2021
Capitalized Contract Cost [Line Items]
Early termination fee received			$ 51.0
Early termination fee receivable			51.0		$ 51.0
Asset Impairment Charges	$ 0.0	$ 0.0	34.5	$ 756.5	34.5
Capitalized Contract Cost, Net			84.2		$ 84.2
Contract With Customers, Invoice Term					30 days
Upfront Rig Mobilizations And Certain Contract Preparation [Member]
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net			73.7		$ 73.7	$ 31.4
Capitalized Contract Cost, Amortization	1.8	1.8	10.5	7.6	22.2
Deferred Certification Costs
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net			10.5		10.5	$ 3.3
Capitalized Contract Cost, Amortization	$ 0.5	$ 0.1	$ 0.8	$ 3.1	$ 1.1
Minimum [Member]
Capitalized Contract Cost [Line Items]
Remaining duration of drilling contracts					1 month
Maximum [Member]
Capitalized Contract Cost [Line Items]
Remaining duration of drilling contracts					3 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
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-Section 45
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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
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-Section 50
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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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- Definition

Drilling Contracts, Term

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Early Termination Fee Received

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