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Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | $ 1,033.7 | $ 1,166.9 | $ 2,065.6 | $ 2,347.8
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | 862.6 | 932.3 | 1,702.6 | 1,876.5
Operating Segments | Life Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | 100.8 | 102.2 | 198.1 | 201.5
Operating Segments | Specialty and Life Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | 963.4 | 1,034.5 | 1,900.7 | 2,078.0
Operating Segments | Non-Core Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | 70.3 | 132.4 | 164.9 | 269.8
Operating Segments | Personal Automobile | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | 691.5 | 766.6 | 1,366.8 | 1,554.5
Operating Segments | Commercial Automobile | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | 171.1 | 165.7 | 335.8 | 322.0
Operating Segments | Life | Life Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | 84.4 | 84.8 | 165.0 | 167.0
Operating Segments | Accident and Health | Life Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | 5.6 | 5.8 | 11.2 | 11.7
Operating Segments | Property | Life Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Premiums Earned, Net | $ 10.8 | $ 11.6 | $ 21.9 | $ 22.8

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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -SubTopic 220 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -SubTopic 220 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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