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Basis of Presentation (Tables) | 9 Months Ended
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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) | 2023 | 2022 |  | 2023 | 2022
Allowance for credit losses, beginning of period | $ | 343.9 |  | $ | 265.8 |  |  | $ | 343.3 |  | $ | 280.4 |
Increase in allowance 1 | 157.5 |  | 130.9 |  |  | 399.7 |  | 320.6 |
Write-offs 2 | (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.

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- Definition Tabular disclosure of allowance for credit loss on premium receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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