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Business Segments - Segment Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Earned Premiums | $ 5,253.7 | $ 4,672.2 | $ 4,472.4
Net Investment Income | 427.3 | 348.2 | 364.3
Other Income (Loss) | 4.8 | 94.6 | 35.5
Total Revenues | 5,793.0 | 5,205.7 | 5,039.2
Income (Loss) from Change in Fair Value of Equity and Convertible Securities | 114.6 | 72.1 | 138.9
Net Realized Gains on the Sales of Investments | 64.8 | 38.1 | 41.9
Net Impairment Losses Recognized in Earnings | (11.0) | (19.5) | (13.8)
Change in Value of Alternative Energy Partnership Investments | (61.2) | 0.0 | 0.0
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 5,619.2 | 5,025.3 | 4,845.9
Operating Segments | Specialty Property & Casualty Insurance |  |  |
Segment Reporting Information [Line Items] |  |  |
Earned Premiums | 3,948.5 | 3,335.3 | 3,078.4
Net Investment Income | 152.5 | 114.1 | 107.5
Other Income (Loss) | 4.1 | 1.8 | 7.0
Total Revenues | 4,076.1 | 3,451.2 | 3,192.9
Change in Value of Alternative Energy Partnership Investments | (29.0) | 0.0 | 0.0
Operating Segments | Preferred Property & Casualty Insurance |  |  |
Segment Reporting Information [Line Items] |  |  |
Earned Premiums | 651.7 | 688.2 | 750.3
Net Investment Income | 68.6 | 37.7 | 44.1
Other Income (Loss) | 0.0 | 0.1 |
Total Revenues | 704.0 | 726.0 | 794.4
Change in Value of Alternative Energy Partnership Investments | (16.3) |  |
Operating Segments | Life & Health Insurance |  |  |
Segment Reporting Information [Line Items] |  |  |
Earned Premiums | 653.5 | 648.7 | 643.7
Net Investment Income | 202.7 | 198.8 | 206.4
Other Income (Loss) | (1.3) | 0.6 | 8.5
Total Revenues | 839.1 | 848.1 | 858.6
Change in Value of Alternative Energy Partnership Investments | (15.8) |  |
Segment Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Income (Loss) from Change in Fair Value of Equity and Convertible Securities | 114.6 | 72.1 | 138.9
Net Realized Gains on the Sales of Investments | 64.8 | 38.1 | 41.9
Net Impairment Losses Recognized in Earnings | (11.0) | (19.5) | (13.8)
Other | $ 5.4 | $ 89.7 | $ 26.3

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