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Credit Losses
 12 Months Ended
Dec. 31, 2024
Credit Loss [Abstract]  
Allowance for Expected Credit Losses Allowance for Expected Credit Losses
The following tables summarize the Company’s allowance for expected credit losses for the twelve months ended December 31, 2024 and December 31, 2023 in available for sale investments, reinsurance recoverables and receivables:
Available for Sale InvestmentsDecember 31,
20242023
($ in millions)
Balance at the beginning of the period$2.9 $7.7 
Additions to the allowance for credit losses on securities for which credit losses were not previously recognized0.3 0.3 
Decreases to the allowance for credit losses on securities that had an allowance in the prior period
(0.9)(3.6)
Reductions to the allowance for securities sold(1.3)(1.5)
Balance at the end of the period$1.0 $2.9 
December 31, 2024December 31, 2023
Reinsurance RecoverablesReceivablesReinsurance RecoverablesReceivables
($ in millions)($ in millions)
Balance at the beginning of the year$3.7 $21.0 $3.7 $25.0 
Movement in the year23.8 3.6 — (4.0)
Balance at the end of the year$27.5 $24.6 $3.7 $21.0