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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, 2021	Sep. 30, 2020	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net	$ 19.3			$ 19.3	$ 19.3
Upfront Rig Mobilizations And Certain Contract Preparation [Member]
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net	17.7			17.7	17.7		$ 13.8
Capitalized Contract Cost, Amortization	11.4	$ 7.0	$ 7.6	13.2		$ 35.9
Deferred Certification Costs
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net	1.6			1.6	$ 1.6		$ 8.4
Capitalized Contract Cost, Amortization	$ 0.1	$ 1.5	$ 3.1	$ 0.2		$ 7.2
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 6 months

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054

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Drilling Contracts, Term

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