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Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net, Life |  |  |  |  |  |  |  |  | $ 381.6 | $ 374.1 | $ 387.6
Premiums Earned, Net, Accident and Health |  |  |  |  |  |  |  |  | 149.4 | 144.9 | 148.6
Earned Premiums | $ 561.4 | $ 558.9 | $ 553.7 | $ 546.0 | $ 541.5 | $ 536.7 | $ 500.1 | $ 431.3 | 2,220.0 | 2,009.6 | 1,862.2
Personal Automobile [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net, Property and Casualty |  |  |  |  |  |  |  |  | 1,244.6 | 1,027.7 | 831.4
Homeowners [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net, Property and Casualty |  |  |  |  |  |  |  |  | 271.9 | 286.3 | 312.4
Other Personal Lines [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net, Property and Casualty |  |  |  |  |  |  |  |  | 119.2 | 122.1 | 127.4
Commercial Automobile [Member] |  |  |  |  |  |  |  |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Premiums Earned, Net, Property and Casualty |  |  |  |  |  |  |  |  | $ 53.3 | $ 54.5 | $ 54.8

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of accident and health premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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