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Revenue from Contracts with Customers Narrative (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net |  | $ 34.7 | $ 34.7 |  |
Minimum |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Drilling Contracts, Term |  |  | 1 month |  |
Maximum |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Drilling Contracts, Term |  |  | 3 years 6 months |  |
Upfront Rig Mobilizations And Certain Contract Preparation [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net |  | 31.4 | $ 31.4 | $ 13.8 |
Capitalized Contract Cost, Amortization | $ 7.6 | 22.0 |  | 42.1 | $ 42.1
Deferred Certification Costs [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net |  | 3.3 | $ 3.3 | 8.4 |
Capitalized Contract Cost, Amortization | $ 3.1 | $ 0.7 |  | $ 8.9 | $ 10.3

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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 http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054 + Details
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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 -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 + Details
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