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Schedule V - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Premiums receivable from underwriting activities |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | $ 25.0 | $ 30.2 | $ 34.0
Charged to Costs and Expenses | (4.0) | (5.2) | (3.8)
Charged to Other Accounts | 0.0 | 0.0 | 0.0
Deductions | 0.0 | 0.0 | 0.0
Balance at End of Year | 21.0 | 25.0 | 30.2
Reinsurance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 0.0 | 0.0 | 0.0
Charged to Costs and Expenses | 0.0 |  |
Charged to Other Accounts | 0.0 | 0.0 | 0.0
Deductions | 0.0 | 0.0 | 0.0
Balance at End of Year | $ 0.0 | $ 0.0 | $ 0.0

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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