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Business Segments - Segment Revenues (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] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums | $ 1,063.6 | $ 1,052.9 | $ 658.1 | $ 609.8 | $ 605.9 | $ 598.2 | $ 582.5 | $ 563.4 | $ 3,384.4 | $ 2,350.0 | $ 2,220.0
Net Investment Income | 91.3 | 92.0 | 78.4 | 79.2 | 82.6 | 85.9 | 77.1 | 81.6 | 340.9 | 327.2 | 298.3
Other Income | 2.0 | 37.8 | 1.2 | 1.2 | 1.1 | 1.0 | 1.0 | 0.9 | 42.2 | 4.0 | 3.2
Total Revenues | 1,094.7 | 1,195.5 | 741.9 | 693.0 | 697.3 | 690.3 | 684.4 | 651.4 | 3,725.1 | 2,723.4 | 2,521.9
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)
Other Noncash Income (Expense) |  |  |  |  |  |  |  |  | 40.6 | 6.2 | 6.3
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 3,384.4 | 2,350.0 | 2,220.0
Total Revenues |  |  |  |  |  |  |  |  | 3,726.9 | 2,675.0 | 2,515.2
Operating Segments [Member] | Preferred Property & Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 730.7 | 730.3 | 741.5
Net Investment Income |  |  |  |  |  |  |  |  | 61.8 | 58.9 | 48.6
Total Revenues |  |  |  |  |  |  |  |  | 792.5 | 789.2 | 790.1
Operating Segments [Member] | Specialty Property & Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 2,027.4 | 1,005.7 | 873.3
Net Investment Income |  |  |  |  |  |  |  |  | 63.4 |  | 29.1
Other Income |  |  |  |  |  |  |  |  | 2.4 | 1.1 | 0.5
Total Revenues |  |  |  |  |  |  |  |  | 2,093.2 | 1,046.0 | 902.9
Operating Segments [Member] | Life and Health Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 626.3 | 614.0 | 605.2
Net Investment Income |  |  |  |  |  |  |  |  | 210.9 | 223.2 | 214.2
Other Income |  |  |  |  |  |  |  |  | 4.0 | 2.6 | 2.8
Total Revenues |  |  |  |  |  |  |  |  | 841.2 | 839.8 | 822.2
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)
Operating Segments [Member] | Specialty Property & Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income |  |  |  |  |  |  |  |  |  | $ 39.2 |

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