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Commitments and contingencies (Details) - Other Commercial Commitments - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Other Commitments [Line Items] |  |
Total | $ 20.8 | $ 49.2
Surety bonds, bank guarantees and performance bonds |  |
Other Commitments [Line Items] |  |
Total | 20.8 | 43.3
Performance guarantee to Opex |  |
Other Commitments [Line Items] |  |
Total | $ 0.0 | $ 5.9

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=borr_SuretyBondsBankGuaranteesAndPerformanceBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_PerformanceGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |