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Commitments and Contingencies (Self-Insurance Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract] |  |  |
Beginning balance — January 1 | $ 79,637 | $ 82,883 | $ 74,071
Losses incurred | 45,282 | 37,392 | 36,319
Losses paid | (23,368) | (40,638) | (27,507)
Ending balance — December 31 | $ 101,551 | $ 79,637 | $ 82,883

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- Definition Self-Insurance Liabilities + References No definition available. + Details
Name: | lpla_SelfInsuranceLiabilities
Namespace Prefix: | lpla_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Self Insurance Liabilities, Losses Incurred + References No definition available. + Details
Name: | lpla_SelfInsuranceLiabilitiesLossesIncurred
Namespace Prefix: | lpla_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Self-Insurance Liabilities, Losses Paid + References No definition available. + Details
Name: | lpla_SelfInsuranceLiabilitiesLossesPaid
Namespace Prefix: | lpla_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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