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Business Segments - Segment Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total Assets | $ 12,989.1 | $ 11,544.9
Specialty Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Total Assets | 4,435.2 | 3,541.0
Preferred Property & Casualty Insurance |  |
Segment Reporting Information [Line Items] |  |
Total Assets | 1,549.8 | 1,567.7
Life & Health Insurance |  |
Segment Reporting Information [Line Items] |  |
Total Assets | 5,847.9 | 5,117.2
Corporate and Other, Net |  |
Segment Reporting Information [Line Items] |  |
Total Assets | $ 1,156.2 | $ 1,319.0

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