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Business Segments - Segment Information (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 26, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Operating Segments | segment |  |  |  | 2 |
Earned Premiums |  | $ 1,052.9 | $ 598.2 | $ 2,320.8 | $ 1,744.1
Net Investment Income |  | 92.0 | 85.9 | 249.6 | 244.6
Other Income |  | 37.8 | 1.0 | 40.2 | 2.9
Total Revenues |  | 1,195.5 | 690.3 | 2,630.4 | 2,026.1
Income from Change in Fair Value of Equity Securities |  | 11.0 | 0.0 | 12.1 | 0.0
Net Realized Gains on Sales of Investments |  | 3.6 | 8.1 | 10.0 | 45.0
Net Impairment Losses Recognized in Earnings |  | (1.8) | (2.9) | (2.3) | (10.5)
Total Before Income Taxes |  | 80.5 | 68.3 | 193.0 | 116.9
Income from Continuing Operations |  | 92.3 | 47.8 | 183.4 | 84.0
Gain (Loss) Related to Litigation Settlement | $ 7.2 |  |  |  |
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income (Loss) |  | 28.7 | (3.7) | 18.0 | (15.2)
Gain (Loss) Related to Litigation Settlement |  | 28.2 | 0.0 | 28.2 | 0.0
Other Nonoperating Income (Expense) |  | (4.6) | (2.0) | (12.0) | (9.7)
Operating Income (Loss), Net of Tax |  | 49.6 | (2.0) | 42.2 | (9.7)
Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit) |  | 26.0 | 0.0 | 26.0 | 0.0
Gain (Loss) Related to Litigation Settlement |  | 35.7 | 0.0 | 35.7 | 0.0
Other Nonoperating Income (Expense) |  | (7.0) | (3.7) | (17.7) | (15.2)
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other Income |  | 43.2 | 2.1 | 48.0 | 8.4
Income from Change in Fair Value of Equity Securities |  | 11.0 | 0.0 | 12.1 | 0.0
Net Realized Gains on Sales of Investments |  | 3.6 | 8.1 | 10.0 | 45.0
Net Impairment Losses Recognized in Earnings |  | (1.8) | (2.9) | (2.3) | (10.5)
Business Combination, Acquisition Related Costs |  | (28.2) | 0.0 | (38.0) | 0.0
Change in Fair Value of Equity Securities, Net of Tax |  | 8.7 | 0.0 | 9.6 | 0.0
Net Realized Gains (Losses) on Sales of Investments, Net of Tax |  | 2.8 | 5.3 | 7.9 | 29.3
Net Impairment Losses Recognized in Earnings, Net of Tax |  | (1.4) | (1.9) | (1.8) | (6.8)
Acquisition Related Transaction, Integration and Other Costs |  | 22.3 | 0.0 | 30.8 | 0.0
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income (Loss) |  | 67.2 | 66.8 | 193.2 | 97.6
Total Revenues |  | 1,139.5 | 683.0 | 2,562.6 | 1,983.2
Income from Continuing Operations |  | 54.9 | 46.4 | 156.3 | 71.2
Operating Segments [Member] | Property and Casualty Insurance [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income (Loss) |  | 34.2 | 30.8 | 96.9 | (2.2)
Earned Premiums |  | 895.2 | 443.5 | 1,851.5 | 1,283.1
Net Investment Income |  | 34.0 | 27.8 | 79.4 | 72.5
Other Income |  | 0.9 | 0.4 | 1.6 | 0.9
Total Revenues |  | 930.1 | 471.7 | 1,932.5 | 1,356.5
Segment Net Operating Income (Loss) |  |  |  | 79.4 | 5.7
Income from Continuing Operations |  | 28.2 | 22.9 |  |
Operating Segments [Member] | Life and Health Insurance [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income (Loss) |  | 33.0 | 36.0 | 96.3 | 99.8
Earned Premiums |  | 157.7 | 154.7 | 469.3 | 461.0
Net Investment Income |  | 50.5 | 55.9 | 157.9 | 163.8
Other Income |  | 1.2 | 0.7 | 2.9 | 1.9
Total Revenues |  | 209.4 | 211.3 | 630.1 | 626.7
Segment Net Operating Income (Loss) |  |  |  | $ 76.9 | $ 65.5
Income from Continuing Operations |  | $ 26.7 | $ 23.5 |  |

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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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