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Business Segments - Segment Information (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |
Number of Operating Segments | segment | 2 |
Earned Premiums | $ 609.8 | $ 563.4
Net Investment Income | 79.2 | 81.6
Other Income | 1.2 | 0.9
Total Revenues | 693.0 | 651.4
Income from Change in Fair Value of Equity Securities | 0.7 | 0.0
Net Realized Gains on Sales of Investments | 2.6 | 10.5
Net Impairment Losses Recognized in Earnings | (0.5) | (5.0)
Total Before Income Taxes | 67.0 | (3.5)
Income (Loss) from Continuing Operations | 53.6 | (0.4)
Corporate, Non-Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment Operating Profit (Loss) | (4.0) | (4.4)
Segment Net Operating Income (Loss) | (2.3) | (3.3)
Segment Reconciling Items [Member] |  |
Segment Reporting Information [Line Items] |  |
Other Income | 3.5 | 4.6
Income from Change in Fair Value of Equity Securities | 0.7 | 0.0
Net Realized Gains on Sales of Investments | 2.6 | 10.5
Net Impairment Losses Recognized in Earnings | (0.5) | (5.0)
Business Combination, Acquisition Related Costs | (6.2) | 0.0
Change in Fair Value of Equity Securities, Net of Tax | 0.6 | 0.0
Net Realized Gains (Losses) on Sales of Investments, Net of Tax | 2.1 | 6.8
Net Impairment Losses Recognized in Earnings, Net of Tax | (0.4) | (3.3)
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Total Revenues | 686.7 | 641.3
Segment Operating Profit (Loss) | 74.4 | (4.6)
Income (Loss) from Continuing Operations | 59.8 | (0.6)
Operating Segments [Member] | Property and Casualty Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 455.2 | 410.4
Net Investment Income | 22.5 | 24.1
Other Income | 0.3 | 0.2
Total Revenues | 478.0 | 434.7
Segment Operating Profit (Loss) | 44.5 | (37.2)
Segment Net Operating Income (Loss) | 36.0 | (22.1)
Operating Segments [Member] | Life and Health Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Earned Premiums | 154.6 | 153.0
Net Investment Income | 53.3 | 53.0
Other Income | 0.8 | 0.6
Total Revenues | 208.7 | 206.6
Segment Operating Profit (Loss) | 29.9 | 32.6
Segment Net Operating Income (Loss) | $ 23.8 | $ 21.5

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + 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(2)) -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 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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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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