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v3.25.4

Summary of Significant Accounting Policies Acquisitions (Details) | 12 Months Ended
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Dec. 31, 2025
Accounting Policies [Abstract] |
Measurement Period of Acquisitions, Maximum | 1 year

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- Definition Measurement Period of Acquisitions, Maximum + References No definition available. + Details
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Namespace Prefix: | lpla_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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