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Business Segments - Earned Premiums by Product Line (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Life | $ 98.4 | $ 98.4 | $ 294.9 | $ 296.0
Earned Premiums, Accident and Health | 40.7 | 41.3 | 121.2 | 124.2
Earned Premiums, Total | 507.5 | 527.3 | 1,530.2 | 1,586.3
Personal Lines [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 354.9 | 376.6 | 1,075.4 | 1,134.4
Automobile [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 239.1 | 261.3 | 729.4 | 794.6
Homeowners [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 82.3 | 80.8 | 244.8 | 236.6
Other Personal Lines [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | 33.5 | 34.5 | 101.2 | 103.2
Commercial Automobile [Member] |  |  |  |
Entity-Wide Information, Revenue from External Customer [Line Items] |  |  |  |
Earned Premiums, Property and Casualty | $ 13.5 | $ 11.0 | $ 38.7 | $ 31.7

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: 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=6588446&loc=d3e574992-122915 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 5: 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 6: 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 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of life 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 3: 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 4: 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 + Details
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