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Business Segments - Earned Premiums by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Life | $ 94.5 | $ 95.8 | $ 285.6 | $ 285.7
Earned Premiums, Accident and Health | 42.0 | 37.6 | 120.6 | 111.2
Total Earned Premiums | 598.2 | 558.9 | 1,744.1 | 1,658.6
Personal Automobile [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 353.0 | 313.8 | 1,012.8 | 927.4
Homeowners [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 66.7 | 68.5 | 199.6 | 204.2
Other Personal Property and Casualty Insurance [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 28.9 | 29.9 | 87.0 | 89.9
Commercial Automobile [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | $ 13.1 | $ 13.3 | $ 38.5 | $ 40.2

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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/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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