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Goodwill and Intangible Assets - Goodwill Rollforward (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |  |  |
Goodwill at the beginning of the period |  | $ 77.1 | $ 77.1 | $ 77.1
Accumulated impairment losses at the beginning of the period |  | (33.6) | (33.6) | (28.0)
Goodwill, net at the beginning of the period |  | 43.5 | 43.5 | 49.1
Acquisitions |  | 12.8 | 0.0 | 0.0
Impairments | $ (2.0) | (2.0) | 0.0 | (5.6)
Goodwill at the end of the period |  | 89.9 | 77.1 | 77.1
Accumulated impairment losses at the end of the period |  | (35.6) | (33.6) | (33.6)
Goodwill, net at the end of the period |  | 54.3 | 43.5 | 43.5
Property & Casualty |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill at the beginning of the period |  | 9.5 | 9.5 | 9.5
Accumulated impairment losses at the beginning of the period |  | 0.0 | 0.0 | 0.0
Goodwill, net at the beginning of the period |  | 9.5 | 9.5 | 9.5
Acquisitions |  | 0.0 | 0.0 | 0.0
Impairments |  | 0.0 | 0.0 | 0.0
Goodwill at the end of the period |  | 9.5 | 9.5 | 9.5
Accumulated impairment losses at the end of the period |  | 0.0 | 0.0 | 0.0
Goodwill, net at the end of the period |  | 9.5 | 9.5 | 9.5
Life & Retirement |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill at the beginning of the period |  | 48.0 | 48.0 | 48.0
Accumulated impairment losses at the beginning of the period |  | (33.6) | (33.6) | (28.0)
Goodwill, net at the beginning of the period |  | 14.4 | 14.4 | 20.0
Acquisitions |  | 0.0 | 0.0 | 0.0
Impairments |  | (2.0) | 0.0 | (5.6)
Goodwill at the end of the period |  | 48.0 | 48.0 | 48.0
Accumulated impairment losses at the end of the period |  | (35.6) | (33.6) | (33.6)
Goodwill, net at the end of the period |  | 12.4 | 14.4 | 14.4
Supplemental & Group Benefits |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill at the beginning of the period |  | 19.6 | 19.6 | 19.6
Accumulated impairment losses at the beginning of the period |  | 0.0 | 0.0 | 0.0
Goodwill, net at the beginning of the period |  | 19.6 | 19.6 | 19.6
Acquisitions |  | 12.8 | 0.0 | 0.0
Impairments |  | 0.0 | 0.0 | 0.0
Goodwill at the end of the period |  | 32.4 | 19.6 | 19.6
Accumulated impairment losses at the end of the period |  | 0.0 | 0.0 | 0.0
Goodwill, net at the end of the period |  | $ 32.4 | $ 19.6 | $ 19.6

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