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Credit Losses (Tables)
 9 Months Ended
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 InvestmentsDecember 31,
20232022
($ 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 recognized0.3 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 $7.7 
Reinsurance Recoverable, Allowance for Credit Loss
December 31, 2023December 31, 2022
($ in millions)($ in millions)
Reinsurance RecoverablesReceivablesReinsurance RecoverablesReceivables
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