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Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Earned Premiums | $ 5,253.7 | $ 4,672.2 | $ 4,472.4
Operating Segments | Specialty Property & Casualty Insurance |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Earned Premiums | 3,948.5 | 3,335.3 | 3,078.4
Operating Segments | Specialty Property & Casualty Insurance | Specialty Automobile |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Earned Premiums | 3,533.7 | 3,031.3 | 2,825.6
Operating Segments | Specialty Property & Casualty Insurance | Commercial Automobile |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Earned Premiums | 414.8 | 304.0 | 252.8
Operating Segments | Preferred Property & Casualty Insurance |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Earned Premiums | 651.7 | 688.2 | 750.3
Operating Segments | Preferred Property & Casualty Insurance | Preferred Automobile |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Earned Premiums | 410.5 | 431.7 | 470.2
Operating Segments | Preferred Property & Casualty Insurance | Homeowners |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Earned Premiums | 207.3 | 220.7 | 241.3
Operating Segments | Preferred Property & Casualty Insurance | Other Personal Lines |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Earned Premiums | 33.9 | 35.8 | 38.8
Operating Segments | Life & Health Insurance |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Earned Premiums | 653.5 | 648.7 | 643.7
Operating Segments | Life & Health Insurance | Life |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Earned Premiums | 401.7 | 385.7 | 384.6
Operating Segments | Life & Health Insurance | Accident & Health |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Earned Premiums | 189.9 | 199.3 | 190.9
Operating Segments | Life & Health Insurance | Property |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |
Earned Premiums | $ 61.9 | $ 63.7 | $ 68.2

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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=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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