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Investments Remaining Contractual Maturity of Secruity Lending Agreements (Details) - Overnight and Continuous - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Transfer of Certain Financial Assets Accounted for as Secured Borrowings |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | $ 109.0 | $ 62.7
Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 109.0 | 62.7
Secured Borrowings, Gross, Difference, Amount | 0.0 | 0.0
Public Utilities |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | 3.9 | 5.2
Short-term Investments |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | 0.0 | 1.0
All Other Corporate Bonds |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | $ 105.1 | $ 56.5

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- Definition Amount of secured borrowings in excess of (less than) the liability for repurchase agreements and securities lending transactions, before offset, included in offsetting disclosures. + 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 (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-7 + Details
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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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