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Credit Losses
 12 Months Ended
Dec. 31, 2022
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, 2022 in investments, reinsurance recoverables and receivables following the adoption of ASU 2016-13 Financial Instruments - Credit Losses (Topic 326)”:

Twelve Months Ended December 31, 2022
($ in millions)
InvestmentsReinsurance RecoverablesReceivablesTotal
Opening value as at January 1, 2022$2.7 $3.3 $30.2 $36.2 
Movement of the allowance for credit losses during the year5.0 0.4 (5.2)0.2 
Closing value as at December 31, 2022$7.7 $3.7 $25.0 $36.4 
Twelve Months Ended December 31, 2021
($ in millions)
InvestmentsReinsurance RecoverablesReceivablesTotal
Opening value as at January 1, 2021$0.2 $3.8 $34.0 $38.0 
Movement of the allowance for credit losses during the year2.5 (0.5)(3.8)(1.8)
Closing value as at December 31, 2021$2.7 $3.3 $30.2 $36.2