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Business Segments - Segment Net Operating Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Segment Net Operating Income | $ 130.0 | $ 104.5 | $ 320.4 | $ 198.5
Loss from Early Extinguishment of Debt | (4.6) | 0.0 | (4.6) | 0.0
Income from Continuing Operations | 129.0 | 92.3 | 406.4 | 183.4
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Net Operating Income | 133.0 | 60.8 | 319.7 | 164.9
Operating Segments | Preferred Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Net Operating Income | 21.1 | 12.2 | 29.1 | 19.7
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Net Operating Income | 78.5 | 21.5 | 220.8 | 67.3
Operating Segments | Life & Health Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Net Operating Income | 33.4 | 27.1 | 69.8 | 77.9
Corporate and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Net Operating Income | (3.0) | 43.7 | 0.7 | 33.6
Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Change in Fair Value of Equity and Convertible Securities | 7.8 | 8.7 | 78.8 | 9.6
Net Realized Gains on Sales of Investments | 1.4 | 2.8 | 30.9 | 7.9
Net Impairment Losses Recognized in Earnings | (1.5) | (1.4) | (9.6) | (1.8)
Acquisition Related Transaction, Integration and Other Costs | $ (4.1) | $ (22.3) | $ (9.5) | $ (30.8)

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