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Schedule I - Investments | 12 Months Ended
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Dec. 31, 2023
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, 2023 ($ in millions)
Type of investment |  | Amortized Cost or Cost |  | Fair Value |  | Amount at which shown in the Balance Sheet
Fixed income maturities |  |  |  |  |  |
U.S. government |  | $ | 1,473.6 |  |  | $ | 1,448.1 |  |  | $ | 1,448.1 |
U.S. agency |  | 7.5 |  |  | 7.2 |  |  | 7.2 |
Municipal |  | 136.9 |  |  | 131.2 |  |  | 131.2 |
Corporate |  | 2,229.9 |  |  | 2,130.8 |  |  | 2,130.8 |
High yield loans |  | 90.8 |  |  | 92.1 |  |  | 92.1 |
Non-U.S. government-backed corporate |  | 115.1 |  |  | 109.0 |  |  | 109.0 |
Non-U.S. government |  | 315.7 |  |  | 308.6 |  |  | 308.6 |
Asset-backed |  | 936.0 |  |  | 908.2 |  |  | 908.2 |
Non-agency commercial mortgage-backed |  | 6.6 |  |  | 5.8 |  |  | 5.8 |
Agency mortgage-backed |  | 544.9 |  |  | 467.3 |  |  | 467.3 |
Total fixed income securities |  | $ | 5,857.0 |  |  | $ | 5,608.3 |  |  | $ | 5,608.3 |
Short term investments |  | $ | 95.7 |  |  | $ | 95.7 |  |  | $ | 95.7 |
Catastrophe bonds |  | $ | 1.6 |  |  | $ | 1.6 |  |  | $ | 1.6 |
Privately held investments (1) |  | $ | 509.6 |  |  | $ | 437.1 |  |  | $ | 489.9 |
Investments, equity method |  |  |  | $ | 7.6 |  |  | $ | 7.6 |
Other investments at fair value (2) |  |  |  | $ | 169.6 |  |  | $ | 209.3 |
Total investments |  |  |  | $ | 6,319.8 |  |  | $ | 6,412.4 |
_________________ (1) Privately-held investments excludes related party investments totaling $112.4 million. (2) Other investments excludes related party investments of $23.9 million in Apollo Real Estate Fund and $15.9 million in Apollo Origination Partnership.

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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//1943274/2147480032/946-320-S99-7 + Details
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