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Segment Information - Additional Significant Financial Information by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
DAC amortization expense | $ 98.7 | $ 94.7 | $ 99.9
Income tax expense (benefit) | (9.3) | 32.1 | 26.3
Property & Casualty |  |  |
Segment Reporting Information [Line Items] |  |  |
DAC amortization expense | 64.3 | 67.7 | 74.4
Property & Casualty | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | (13.8) | 13.2 | 15.4
Life & Retirement |  |  |
Segment Reporting Information [Line Items] |  |  |
DAC amortization expense | 32.8 | 25.5 | 23.8
Income tax expense (benefit) | 6.6 | 13.6 | 4.6
Supplemental & Group Benefits |  |  |
Segment Reporting Information [Line Items] |  |  |
DAC amortization expense | 1.6 | 1.5 | 1.7
Supplemental & Group Benefits | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | 16.1 | 12.6 | 12.0
Corporate & Other | Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | $ (18.2) | $ (7.3) | $ (5.7)

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