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Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Deferred Policy Acquisition Costs | $ 296.2 | $ 319.0 | $ 290.8 |
Net Reserves for Losses and LAE | 3,232.8 | 2,813.2 | 4,313.7 | $ 3,970.1
Net Reserves for Unearned Premiums | 1,692.8 | 1,720.2 | 1,516.2 |
Net earned premiums | 2,614.5 | 2,688.7 | 2,410.5 |
Net Investment Income | 275.7 | 188.1 | 147.5 |
Losses and LAE Expenses | 1,553.0 | 1,680.0 | 1,693.3 |
Policy Acquisition Expenses | 380.2 | 431.8 | 414.1 |
Net written premiums | 2,581.9 | 2,896.0 | 2,587.7 |
General and Administrative Expenses | 354.5 | 386.5 | 333.1 |
Reinsurance |  |  |  |
Deferred Policy Acquisition Costs | 201.5 | 227.2 | 205.2 |
Net Reserves for Losses and LAE | 1,373.1 | 1,360.7 | 2,148.4 |
Net Reserves for Unearned Premiums | 644.5 | 862.4 | 688.6 |
Net earned premiums | 1,154.5 | 1,251.8 | 1,118.8 |
Losses and LAE Expenses | 611.1 | 770.3 | 705.2 |
Policy Acquisition Expenses | 208.6 | 252.4 | 221.6 |
Net written premiums | 1,098.0 | 1,426.4 | 1,199.0 |
General and Administrative Expenses | 120.6 | 142.5 | 121.3 |
Insurance |  |  |  |
Deferred Policy Acquisition Costs | 94.7 | 91.8 | 85.6 |
Net Reserves for Losses and LAE | 1,859.7 | 1,452.5 | 2,165.3 |
Net Reserves for Unearned Premiums | 1,048.3 | 857.8 | 827.6 |
Net earned premiums | 1,460.0 | 1,436.9 | 1,291.7 |
Losses and LAE Expenses | 941.9 | 909.7 | 988.1 |
Policy Acquisition Expenses | 171.6 | 179.4 | 192.5 |
Net written premiums | 1,483.9 | 1,469.6 | 1,388.7 |
General and Administrative Expenses | $ 233.9 | $ 244.0 | $ 211.8 |

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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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