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Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2024
Variable Interest Entity [Line Items] |  |  |  |
Percentage of outstanding equity interests | 50.00% |  |  |
Maximum exposure to trusts | $ 36.4 |  |  |
Reimbursement obligation coverage percentage | 12.00% |  |  | 12.00%
Marathon Direct Lending SLP, LLC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership percentage | 50.00% |  |  |
MW Advisor, LLC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership percentage | 50.00% |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Deposits assumed | $ 166.5 | $ 304.3 | $ 334.9 |
Non-marketable investment carrying value | 271.1 | 216.5 |  |
Variable Interest Entity, Not Primary Beneficiary | Unfunded Loan Commitment |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Maximum exposure to loss | $ 401.2 | $ 332.8 |  |

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