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Schedule I - Investments | 12 Months Ended
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Dec. 31, 2024
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Abstract] |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Text Block] | SCHEDULE I - CONSOLIDATED SUMMARY OF INVESTMENTS OTHER THAN INVESTMENTS IN RELATED PARTIES For the Twelve Months Ended December 31, 2024 ($ in millions)
Type of investment |  | Amortized Cost or Cost |  | Fair Value |  | Amount at which shown in the Balance Sheet
Fixed income securities |  |  |  |  |  |
U.S. government |  | $ | 1,767.7 |  |  | $ | 1,741.9 |  |  | $ | 1,741.9 |
U.S. agency |  | 7.5 |  |  | 7.2 |  |  | 7.2 |
Municipal |  | 85.8 |  |  | 83.9 |  |  | 83.9 |
Corporate |  | 2,200.8 |  |  | 2,137.5 |  |  | 2,137.5 |
High Yield Loans |  | 101.7 |  |  | 102.4 |  |  | 102.4 |
Non-U.S. government-backed corporate |  | 135.7 |  |  | 134.1 |  |  | 134.1 |
Non-U.S. government |  | 272.6 |  |  | 271.2 |  |  | 271.2 |
Asset-backed (1) |  | 767.7 |  |  | 770.8 |  |  | 859.7 |
Agency commercial mortgage-backed |  | 5.0 |  |  | 4.4 |  |  | 4.4 |
Agency residential mortgage-backed |  | 635.0 |  |  | 549.8 |  |  | 549.8 |
Total fixed income securities |  | $ | 5,979.5 |  |  | $ | 5,803.2 |  |  | $ | 5,892.1 |
Short term investments |  | $ | 262.9 |  |  | $ | 262.9 |  |  | $ | 262.9 |
Catastrophe bonds |  | $ | 1.0 |  |  | $ | 1.0 |  |  | $ | 1.0 |
Privately held investments (2) |  | $ | 312.0 |  |  | $ | 237.4 |  |  | $ | 311.0 |
Investments, equity method |  |  |  | $ | 7.3 |  |  | $ | 7.3 |
Other investments at fair value (3) |  |  |  | $ | 188.6 |  |  | $ | 267.2 |
Total investments |  |  |  | $ | 6,589.3 |  |  | $ | 6,741.5 |
________________ (1)Fixed income securities, asset-backed excludes related party investments totaling fair value of $88.9 million. (2)Privately-held investments excludes related party investments totaling $73.6 million. (3)Other investments excludes related party investments of $78.6 million in Funds managed by Apollo.

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- Definition The entire disclosure of information about investment held by insurance company, excluding investment in related party. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 15 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-7 + Details
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