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v3.25.2

Commitments and Contingencies (Details) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 item | Jun. 30, 2025 USD ($)
Commitments and Contingencies. |  |
Concorde incentive payments | $ |  | $ 50
Number of teams received incentive payments | item | 10 |

X
- Definition Amount of incentive payments under concorde agreement. + References No definition available. + Details
Name: | lmca_ConcordeAgreementIncentivePayments
Namespace Prefix: | lmca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents number of teams received incentive payments for signing concorde commercial agreement. + References No definition available. + Details
Name: | lmca_ConcordeCommercialAgreementNumberOfTeamsReceivedIncentivePayment
Namespace Prefix: | lmca_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration