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Business Segments - Segment Operating Profit (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | $ 286.2 | $ 118.9 | $ 3.1
Equity Securities, FV-NI | $ (64.3) |  |  |  | $ 0.0 |  |  |  | (64.3) | 0.0 | 0.0
Net Realized Gains on Sales of Investments |  |  |  |  |  |  |  |  | 26.4 | 56.5 | 33.1
Net Impairment Losses Recognized in Earnings | (2.2) | $ (1.8) | $ 0.0 | $ (0.5) | (3.8) | $ (2.9) | $ (2.6) | $ (5.0) | (4.5) | (14.3) | (32.7)
Income (Loss) from Continuing Operations before Income Taxes | 6.1 | $ 80.5 | $ 45.5 | $ 67.0 | 44.2 | $ 68.3 | $ 52.1 | $ (3.5) | 199.1 | 161.1 | 3.5
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 290.1 | 142.6 | 34.8
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 28.6 | (78.1) | 15.8
Operating Segments [Member] | Specialty Property & Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 145.6 | 80.5 | (27.7)
Operating Segments [Member] | Life and Health Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 115.9 | 140.2 | 46.7
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | (3.9) | (23.7) | (31.7)
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI | (64.3) |  |  |  | 0.0 |  |  |  | (64.3) | 0.0 | 0.0
Net Realized Gains on Sales of Investments |  |  |  |  |  |  |  |  | 26.4 | 56.5 | 33.1
Net Impairment Losses Recognized in Earnings |  |  |  |  |  |  |  |  | (4.5) | (14.3) | (32.7)
Business Acquisition, Transaction Costs | $ (44.7) |  |  |  | $ 0.0 |  |  |  | $ (44.7) | $ 0.0 | $ 0.0

X
- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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