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Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |
Earned Premiums | $ 1,200.8 | $ 1,166.4
Operating Segments | Specialty Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 877.6 | 822.5
Operating Segments | Preferred Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 162.2 | 180.9
Operating Segments | Life & Health Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 161.0 | 163.0
Operating Segments | Specialty Automobile | Specialty Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 785.4 | 753.2
Operating Segments | Commercial Automobile | Specialty Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 92.2 | 69.3
Operating Segments | Personal Automobile | Preferred Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 103.0 | 114.9
Operating Segments | Homeowners | Preferred Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 50.8 | 56.8
Operating Segments | Other Personal Lines | Preferred Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 8.4 | 9.2
Operating Segments | Life | Life & Health Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 98.1 | 97.2
Operating Segments | Accident and Health | Life & Health Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 47.4 | 49.4
Operating Segments | Property | Life & Health Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | $ 15.5 | $ 16.4

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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