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Allowance for Credit Losses (Tables)
 12 Months Ended
Dec. 31, 2021
Credit Loss [Abstract]  
Summary of Changes in CECL Allowance for Reinsurance Recoverables
The following table presents the changes in the allowance for credit losses for reinsurance recoverables for the periods indicated:
Total
Balance, December 31, 2019$— 
Cumulative effect of adoption0.3 
Current period change for credit losses0.1 
Balance, December 31, 20200.4 
Current period change for credit losses$(0.1)
Balance, December 31, 2021$0.3