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Equity Method Investments - Narrative (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 04, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) rig | Aug. 03, 2021
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Interest in equity method investment not held by the company |  |  |  | 51.00% |
Proceeds from disposal of equity method investments |  | $ 10.6 | $ 0.0 | $ 0.0 |
Equity method investments |  | 19.4 | $ 62.7 | 27.7 |
Funding provided by shareholder loans | $ 5.4 |  |  |  |
Opex |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Percentage acquired share by the entity | 49.00% |  | 49.00% |  | 49.00%
Ownership percentage sold | 49.00% |  |  |  |
Equity method investments |  | 0.0 | $ 5.2 | (3.7) |
Akal |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Percentage acquired share by the entity | 49.00% |  |  |  | 49.00%
Ownership percentage sold | 49.00% |  |  |  |
Equity method investments |  | 0.0 | 0.0 | $ 0.0 |
Perfomex and Perfomex II |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Percentage acquired share by the entity | 51.00% |  |  | 49.00% |
Number of rigs on bareboat charter | rig |  |  |  | 5 |
Number of joint ventures for bareboat charters | rig |  |  |  | 2 |
Perfomex and Perfomex II | Opex and Akal |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Contracts receivable |  | 86.8 |  |  |
Billed contracts receivable |  | 70.5 |  |  |
Unbilled contracts receivable |  | 16.3 |  |  |
Perfomex |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Percentage acquired share by the entity | 49.00% |  |  |  | 49.00%
Additional ownership percentage acquired | 2.00% |  |  |  |
Equity method investments |  | 16.9 | 48.0 | $ 31.4 |
Funding provided by shareholder loans |  | 9.8 |  |  |
Opex and Akal |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Realized gain on disposal of investment | $ 3.6 |  |  |  |
Proceeds from disposal of equity method investments | 10.6 |  |  |  |
Equity method investments | 7.0 |  |  |  |
Opex and Akal | Perfomex |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Contracts receivable | 237.1 |  |  |  |
Billed contracts receivable | 113.7 |  | 97.6 |  |
Unbilled contracts receivable | $ 123.4 |  | 172.0 |  |
Perfomex II |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Percentage acquired share by the entity | 49.00% |  |  |  | 49.00%
Additional ownership percentage acquired | 2.00% |  |  |  |
Equity method investments |  | $ 2.5 | $ 9.5 | $ 0.0 |
Borr Mexico Ventures Limited | Opex |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Percentage acquired share by the entity |  |  |  | 49.00% |
Borr Mexico Ventures Limited | Akal |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |
Percentage acquired share by the entity |  |  |  | 49.00% |

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