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v3.25.2

Contingent Liabilities (Details) $ in Millions | May 29, 2025 USD ($)
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Minimum |
Contingent Liabilities |
Continuity benefits, estimate of possible expense | $ 265.0
Maximum |
Contingent Liabilities |
Continuity benefits, estimate of possible expense | $ 515.0

X
- Definition Reflects the estimated amount of continuity benefit expense. + References No definition available. + Details
Name: | tmc_ContinuityBenefitsEstimateOfPossibleExpense
Namespace Prefix: | tmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |