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Business Segments - Segment Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment | Jun. 30, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of Operating Segments | segment |  |  | 2 |
Earned Premiums | $ 658.1 | $ 582.5 | $ 1,267.9 | $ 1,145.9
Net Investment Income | 78.4 | 77.1 | 157.6 | 158.7
Other Income | 1.2 | 1.0 | 2.4 | 1.9
Total Revenues | 741.9 | 684.4 | 1,434.9 | 1,335.8
Income from Change in Fair Value of Equity Securities | 0.4 | 0.0 | 1.1 | 0.0
Net Realized Gains on Sales of Investments | 3.8 | 26.4 | 6.4 | 36.9
Net Impairment Losses Recognized in Earnings | 0.0 | (2.6) | (0.5) | (7.6)
Total Before Income Taxes | 45.5 | 52.1 | 112.5 | 48.6
Income from Continuing Operations | 37.5 | 36.6 | 91.1 | 36.2
Corporate, Non-Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Operating Profit (Loss) | (6.7) | (7.1) | (10.7) | (11.5)
Segment Net Operating Income (Loss) | (5.1) | (4.4) | (7.4) | (7.7)
Segment Reconciling Items [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other Income | 1.3 | 1.7 | 4.8 | 6.3
Income from Change in Fair Value of Equity Securities | 0.4 | 0.0 | 1.1 | 0.0
Net Realized Gains on Sales of Investments | 3.8 | 26.4 | 6.4 | 36.9
Net Impairment Losses Recognized in Earnings | 0.0 | (2.6) | (0.5) | (7.6)
Business Combination, Acquisition Related Costs | (3.6) | 0.0 | (9.8) | 0.0
Change in Fair Value of Equity Securities, Net of Tax | 0.3 | 0.0 | 0.9 | 0.0
Net Realized Gains (Losses) on Sales of Investments, Net of Tax | 3.0 | 17.2 | 5.1 | 24.0
Net Impairment Losses Recognized in Earnings, Net of Tax | 0.0 | (1.6) | (0.4) | (4.9)
Acquisition Related Transaction and Integration Costs | 2.3 | 0.0 | 8.5 | 0.0
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 736.4 | 658.9 | 1,423.1 | 1,300.2
Segment Operating Profit (Loss) | 51.6 | 35.4 | 126.0 | 30.8
Income from Continuing Operations | 41.6 | 25.4 | 101.4 | 24.8
Operating Segments [Member] | Property and Casualty Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 501.1 | 429.2 | 956.3 | 839.6
Net Investment Income | 22.9 | 20.6 | 45.4 | 44.7
Other Income | 0.4 | 0.3 | 0.7 | 0.5
Total Revenues | 524.4 | 450.1 | 1,002.4 | 884.8
Segment Operating Profit (Loss) | 18.2 | 4.2 | 62.7 | (33.0)
Segment Net Operating Income (Loss) |  |  | 51.2 | (17.2)
Income from Continuing Operations | 15.2 | 4.9 |  |
Operating Segments [Member] | Life and Health Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 157.0 | 153.3 | 311.6 | 306.3
Net Investment Income | 54.1 | 54.9 | 107.4 | 107.9
Other Income | 0.9 | 0.6 | 1.7 | 1.2
Total Revenues | 212.0 | 208.8 | 420.7 | 415.4
Segment Operating Profit (Loss) | 33.4 | 31.2 | 63.3 | 63.8
Segment Net Operating Income (Loss) |  |  | $ 50.2 | $ 42.0
Income from Continuing Operations | $ 26.4 | $ 20.5 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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