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Allowance for Credit Losses
 12 Months Ended
Dec. 31, 2022
Credit Loss [Abstract]  
Allowance for Credit Losses Allowance for Credit Losses
Premiums receivable
The following table represents the balances of premiums receivable, net of allowance for uncollectible premiums, including expected lifetime credit losses, at December 31, 2022 and December 31, 2021, and the changes in the allowance for the year ended December 31, 2022 and December 31, 2021.
(in millions)Premiums Receivable, Net of Allowance for Estimated Uncollectible PremiumsAllowance for Estimated Uncollectible Premiums
Balance, December 31, 2020$679.8 $9.4 
Current period change for estimated uncollectible premiums(3.1)
Write-offs of uncollectible premiums receivable(0.6)
Balance, December 31, 2021$648.6 $5.7 
Current period change for estimated uncollectible premiums0.2 
Write-offs of uncollectible premiums receivable(1)
(1.2)
Balance, December 31, 2022$292.0 $4.7 
(1)Includes allowance transferred as a result of divestitures in the amount of $1.5 million.
Reinsurance Recoverables
The following table presents the balances of reinsurance recoverables, net of the allowance for estimated uncollectible reinsurance, including expected credit losses, at December 31, 2022 and December 31, 2021, and changes in the allowance for estimated uncollectible reinsurance for the year ended December 31, 2022 and December 31, 2021.
(in millions) Reinsurance Recoverables, Net of Allowance for Estimated Uncollectible ReinsuranceAllowance for Estimated Uncollectible Reinsurance
Balance, December 31, 2020$3,009.0 $4.1 
Current period change for estimated uncollectible reinsurance(0.3)
Write-offs of uncollectible reinsurance recoverables— 
Balance, December 31, 2021$2,966.4 $3.8 
Current period change for estimated uncollectible reinsurance1.7 
Write-offs of uncollectible reinsurance recoverables— 
 Reclassified to assets held-for-sale(0.8)
Balance, December 31, 2022$3,029.1 $4.7 
We primarily utilize A.M. Best credit ratings when determining the allowance, adjusted as needed based on our historical experience with the reinsurers. Certain of our reinsurance recoverables are collateralized by letters of credit, funds held or trust agreements.