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Allowance for Credit Losses (Tables)
 9 Months Ended
Sep. 30, 2020
Credit Loss [Abstract]  
Premium Receivable, Allowance for Credit Loss
The following table represents the balances of premiums receivable, net of allowance for expected credit losses, at September 30, 2020 and January 1, 2020, and the changes in the allowance for expected credit losses for the nine months ended September 30, 2020.
(in millions)Premiums Receivable, Net of Allowance for Estimated Uncollectible PremiumsAllowance for Estimated Uncollectible Premiums
Balance, January 1, 2020$688.2 $7.9 
Cumulative effect of adoption of ASU 2016-13 at January 1, 2020
— 
Current period change for estimated uncollectible premiums1.0 
Write-offs of uncollectible premiums receivable— 
Foreign exchange adjustments0.2 
Balance, September 30, 2020$797.0 $9.1 
Reinsurance Recoverable, Allowance for Credit Loss
Reinsurance Recoverables
The following table presents the balances of reinsurance recoverables, net of the allowance for estimated uncollectible reinsurance, at September 30, 2020 and January 1, 2020, and changes in the allowance for estimated uncollectible reinsurance for the nine months ended September 30, 2020.
(in millions) Reinsurance Recoverables, Net of Allowance for Estimated Uncollectible ReinsuranceAllowance for Estimated Uncollectible Reinsurance
Balance, January 1, 2020$3,104.6 $1.1 
Cumulative effect of adoption of ASU 2016-13 at January 1, 2020
2.5 
Current period change for estimated uncollectible reinsurance0.1 
Write-offs of uncollectible reinsurance recoverables— 
Balance, September 30, 2020$3,046.5 $3.7