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Newbuildings (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2020 | Jan. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Carrying Value Of New Buildings [Roll Forward] |  |  |  |
Opening balance |  | $ 261.4 | $ 135.5 | $ 261.4
Additions |  |  | 0.0 | 181.8
Capitalized interest |  |  | 0.0 | 5.0
Transfers to jack-up rigs |  |  | 0.0 | (312.7)
Total newbuildings |  |  | 135.5 | 135.5
Rigs Delivered Final Installment And Related Financing [Abstract] |  |  |  |
First Installment |  |  |  | 115.2
Final Installment |  |  |  | 181.8
Capitalized Costs |  |  |  | 15.7
Transferred to Jack-Up Rigs |  |  | 0.0 | 312.7
Heimdal |  |  |  |
Rigs Delivered Final Installment And Related Financing [Abstract] |  |  |  |
Delivery Financing |  | $ 90.9 |  |
Shipyard |  | Keppel |  |
First Installment |  | $ 57.6 |  |
Final Installment |  | 90.9 |  |
Capitalized Costs |  | 8.4 |  |
Transferred to Jack-Up Rigs |  | $ 156.9 |  | 156.9
Hild |  |  |  |
Rigs Delivered Final Installment And Related Financing [Abstract] |  |  |  |
Delivery Financing | $ 90.9 |  |  |
Shipyard | Keppel |  |  |
First Installment | $ 57.6 |  |  |
Final Installment | 90.9 |  |  |
Capitalized Costs | 7.3 |  |  |
Transferred to Jack-Up Rigs | $ 155.8 |  |  | 155.8
Keppel Rigs |  |  |  |
Rigs Delivered Final Installment And Related Financing [Abstract] |  |  |  |
Final Installment |  |  | $ 448.2 | $ 448.2

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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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