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Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | $ 1,135.2 | $ 1,052.9 | $ 3,326.6 | $ 2,320.8
Operating Segments | Preferred Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 191.0 | 184.0 | 565.1 | 541.9
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 783.4 | 711.2 | 2,278.7 | 1,309.6
Operating Segments | Life & Health Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 160.8 | 157.7 | 482.8 | 469.3
Operating Segments | Personal Automobile | Preferred Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 119.7 | 111.4 | 353.0 | 325.0
Operating Segments | Homeowners | Preferred Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 61.5 | 62.5 | 182.6 | 186.5
Operating Segments | Other Personal Lines | Preferred Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 9.8 | 10.1 | 29.5 | 30.4
Operating Segments | Specialty Automobile | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 719.2 | 655.3 | 2,092.5 | 1,229.0
Operating Segments | Commercial Automobile | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 64.2 | 55.9 | 186.2 | 80.6
Operating Segments | Life | Life & Health Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 96.2 | 95.2 | 289.0 | 284.3
Operating Segments | Accident and Health | Life & Health Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 47.6 | 44.9 | 142.4 | 132.0
Operating Segments | Property | Life & Health Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | $ 17.0 | $ 17.6 | $ 51.4 | $ 53.0

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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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