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Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | $ 1,337.7 | $ 1,085.3 | $ 2,538.5 | $ 2,251.7
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 1,010.3 | 759.0 | 1,887.9 | 1,581.5
Operating Segments | Preferred Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 163.2 | 163.6 | 325.4 | 344.5
Operating Segments | Life & Health Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 164.2 | 162.7 | 325.2 | 325.7
Operating Segments | Specialty Automobile | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 909.6 | 689.8 | 1,695.0 | 1,443.0
Operating Segments | Commercial Automobile | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 100.7 | 69.2 | 192.9 | 138.5
Operating Segments | Personal Automobile | Preferred Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 103.5 | 99.1 | 206.5 | 214.0
Operating Segments | Homeowners | Preferred Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 51.3 | 55.6 | 102.1 | 112.4
Operating Segments | Other Personal Lines | Preferred Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 8.4 | 8.9 | 16.8 | 18.1
Operating Segments | Life | Life & Health Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 100.6 | 95.7 | 198.7 | 192.9
Operating Segments | Accident and Health | Life & Health Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 47.9 | 50.8 | 95.3 | 100.2
Operating Segments | Property | Life & Health Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | $ 15.7 | $ 16.2 | $ 31.2 | $ 32.6

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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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