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Investments - Securities Lending Transactions (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Fair value of securities lent | $ 12.3 |
Collateral that is not permitted to be sold or repledged | 0.0 |
Corporate debt securities |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Fair value of securities lent | 12.2 | $ 7.3
Equity securities | Financial services sector |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Fair value of securities lent | 0.1 |
Cash equivalents |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |
Fair value of cash collateral | $ 12.7 |

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- Definition Amount, before effects of master netting arrangements, of financial assets loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and financial assets transferred other than securities that qualify as secured borrowings. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481395/860-30-55-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-7 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a)(1) -SubTopic 30 -Topic 860 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-7 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (b)(1) -SubTopic 30 -Topic 860 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A + Details
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