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Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Earned Premiums | $ 1,166.4 | $ 1,074.8
Operating Segments | Specialty Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 822.5 | 729.3
Operating Segments | Preferred Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 180.9 | 185.6
Operating Segments | Life & Health Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 163.0 | 159.9
Operating Segments | Specialty Automobile | Specialty Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 753.2 | 669.6
Operating Segments | Commercial Automobile | Specialty Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 69.3 | 59.7
Operating Segments | Personal Automobile | Preferred Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 114.9 | 115.4
Operating Segments | Homeowners | Preferred Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 56.8 | 60.3
Operating Segments | Other Personal Lines | Preferred Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 9.2 | 9.9
Operating Segments | Life | Life & Health Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 97.2 | 95.8
Operating Segments | Accident and Health | Life & Health Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 49.4 | 46.9
Operating Segments | Property | Life & Health Insurance |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | $ 16.4 | $ 17.2

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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=116637232&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=34713774&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=116637391&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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