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Business Segments - Segment Assets (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Segment Reporting Information [Line Items] |  |
Total Assets | $ 8,210.5 | $ 8,036.1
Property and Casualty Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Assets | 2,815.1 | 2,749.0
Life and Health Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Assets | 4,888.7 | 4,733.9
Corporate and Other, Net [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Assets | $ 506.7 | $ 553.2

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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