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Basis of Presentation (Tables)
 6 Months Ended
Jun. 30, 2024
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 June 30,Six Months Ended June 30,
(millions)2024202320242023
Allowance for credit losses, beginning of period$327.7 $340.9 $369.1 $343.3 
Increase in allowance1
128.0 125.3 234.8 242.2 
Write-offs2
(127.8)(122.3)(276.0)(241.6)
Allowance for credit losses, end of period$327.9 $343.9 $327.9 $343.9 
1 Represents the incremental increase in other underwriting expenses.
2 Represents the portion of allowance that is reversed when the premiums receivable is written off. Premiums receivable balances are written off once we have exhausted our collection efforts.