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Investments - Securities Lending Collateral - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Securities Received as Collateral [Abstract] |  |
Securities loaned, minimum collateral to loan ratio | 102.00% |
Securities loaned, additional collateral requirement, decline in collateral value threshold percentage | 100.00% |
Cash collateral received and reinvested | $ 104.5 | $ 86.0

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- Definition Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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