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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Capitalized Contract Cost [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net | $ 51.2 |  | $ 51.2 |  |
Upfront Rig Mobilizations And Certain Contract Preparation [Member] |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net | 41.9 |  | 41.9 |  | $ 47.4
Capitalized Contract Cost, Amortization | 9.1 | $ 41.2 | 30.7 | $ 90.3 |
Deferred Certification Costs |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net | 9.3 |  | 9.3 |  | $ 12.9
Capitalized Contract Cost, Amortization | $ 1.9 | $ 2.0 | $ 6.3 | $ 7.6 |
Minimum |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Remaining duration of drilling contracts | 1 month |  | 1 month |  |
Maximum |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Remaining duration of drilling contracts | 5 years |  | 5 years |  |

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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 -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + 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 -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 + Details
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