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v3.20.4

Business Segments - Segment Net Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Segment Net Operating Income (Loss) |  |  |  |  |  | $ 438.8 | $ 418.3 | $ 258.4
Loss from Early Extinguishment of Debt |  |  |  |  |  | (50.6) | (4.6) | 0.0
Income from Continuing Operations | $ 97.5 | $ 122.3 | $ 126.1 | $ 64.0 | $ 188.4 | 409.9 | 531.1 | 188.4
Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Segment Net Operating Income (Loss) |  |  |  |  |  | 401.4 | 423.7 | 233.0
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Segment Net Operating Income (Loss) |  |  |  |  |  | 337.9 | 283.1 | 115.8
Operating Segments | Preferred Property & Casualty Insurance |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Segment Net Operating Income (Loss) |  |  |  |  |  | 3.5 | 41.9 | 25.7
Operating Segments | Life & Health Insurance |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Segment Net Operating Income (Loss) |  |  |  |  |  | 60.0 | 98.7 | 91.5
Corporate, Non-Segment |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Segment Net Operating Income (Loss) |  |  |  |  |  | 37.4 | (5.4) | 25.4
Effects of Tax Law Changes |  |  |  |  |  | 0.0 | 0.0 | 26.4
Partial Satisfaction of Judgment |  |  |  |  |  | 70.6 | 15.9 | 28.2
Other |  |  |  |  |  | (33.2) | (21.3) | (29.2)
Segment Reconciling Items |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Change in Fair Value of Equity and Convertible Securities |  |  |  |  |  | 57.0 | 109.7 | (50.8)
Net Realized Gains on Sales of Investments |  |  |  |  |  | 30.1 | 33.1 | 20.9
Impairment Losses |  |  |  |  |  | (15.4) | (10.9) | (3.6)
Acquisition Related Transaction, Integration and Other Costs |  |  |  |  |  | $ (50.0) | $ (14.5) | $ (36.5)

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