Commitments and Contingencies (Financial Instruments and Collateral) (Details) - USD ($) $ in Millions |
Dec. 31, 2023 |
Dec. 31, 2022 |
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| Letters of credit | ||
| Debt Instrument [Line Items] | ||
| Securities collateral | $ 466.9 | $ 475.0 |
| Surety bonds | ||
| Debt Instrument [Line Items] | ||
| Securities collateral | $ 4,677.1 | $ 4,322.3 |
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- 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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