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Basis of Presentation (Tables) | 6 Months Ended
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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) | 2024 | 2023 |  | 2024 | 2023
Allowance for credit losses, beginning of period | $ | 327.7 |  | $ | 340.9 |  |  | $ | 369.1 |  | $ | 343.3 |
Increase in allowance 1 | 128.0 |  | 125.3 |  |  | 234.8 |  | 242.2 |
Write-offs 2 | (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.

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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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