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Basis of Presentation (Tables)
 9 Months Ended
Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Premium Receivable, Allowance for Credit Loss The following table summarizes changes in our allowance for credit loss exposure on our premiums receivable:
Three Months Ended September 30,Nine Months Ended September 30,
(millions)2023202220232022
Allowance for credit losses, beginning of period$343.9 $265.8 $343.3 $280.4 
Increase in allowance1
157.5 130.9 399.7 320.6 
Write-offs2
(140.2)(101.7)(381.8)(306.0)
Allowance for credit losses, end of period$361.2 $295.0 $361.2 $295.0 
1 Represents the incremental increase in other underwriting expenses.
2 Represents the portion of the allowance that is reversed when premiums receivable are written off. Premiums receivable balances are written off once we have exhausted our collection efforts.