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Segment Information - Additional Significant Financial Information by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |  |
DAC amortization expense | $ 101.2 | $ 88.2 | [1] | $ 90.6 | [1]
Income tax expense (benefit) | 8.3 | (3.3) | [1] | 39.7 | [1]
Property & Casualty | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
DAC amortization expense | 71.3 | 64.3 |  | 67.7 |
Income tax expense (benefit) | (9.8) | (13.8) |  | 13.2 |
Life & Retirement | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
DAC amortization expense | 28.0 | 23.0 |  | 22.0 |
Income tax expense (benefit) | 15.1 | 10.6 |  | 19.3 |
Supplemental & Group Benefits | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
DAC amortization expense | 1.9 | 0.9 |  | 0.9 |
Income tax expense (benefit) | 14.8 | 18.1 |  | 14.5 |
Corporate & Other | Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income tax expense (benefit) | $ (11.8) | $ (18.2) |  | $ (7.3) |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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