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Credit Losses (Tables) | 9 Months Ended
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Sep. 30, 2024
Credit Loss [Abstract] |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | The following tables summarize the Company’s allowance for expected credit losses for the twelve months ended December 31, 2023 and December 31, 2022 in available for sale investments, reinsurance recoverables and receivables:
Available for Sale Investments | December 31,
| 2023 |  | 2022
| ($ in millions)
Balance at the beginning of the period | $ | 7.7 |  |  | $ | 2.7 |
Additions to the allowance for credit losses on securities for which credit losses were not previously recognized | 0.3 |  |  | 5.4 |
Increases/(decreases) to the allowance for credit losses on securities that had an allowance in the prior period | (3.6) |  |  | 0.2 |
Reductions to the allowance for securities sold | (1.5) |  |  | (0.6) |
Balance at the end of the period | $ | 2.9 |  |  | $ | 7.7 |
Reinsurance Recoverable, Allowance for Credit Loss |
| December 31, 2023 |  | December 31, 2022
| ($ in millions) |  | ($ in millions)
| Reinsurance Recoverables |  | Receivables |  | Reinsurance Recoverables |  | Receivables
Balance at the beginning of the year | $ | 3.7 |  |  | $ | 25.0 |  |  | $ | 3.3 |  |  | $ | 30.2 |
Movement in the year | — |  |  | (4.0) |  |  | 0.4 |  |  | (5.2) |
Balance at the end of the year | $ | 3.7 |  |  | $ | 21.0 |  |  | $ | 3.7 |  |  | $ | 25.0 |

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- Definition Tabular disclosure of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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- Definition Tabular disclosure of allowance for credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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