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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Line Items] |  |  |  |
Goodwill impairment |  | $ 0.0 | $ 2.0 | $ 0.0
Impairment of infinite lived intangible assets |  | $ 0.0 | 0.3 | 0.0
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other expense - goodwill and intangible asset impairments |  |
Trade Names |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment of infinite lived intangible assets |  | $ 0.0 | $ 0.3 | $ 0.0
Benefit Consultants Group Inc. |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible assets |  | 9.1 |  |
Benefit Consultants Group Inc. | Trade Names |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment of infinite lived intangible assets |  | 0.3 |  |
Benefit Consultants Group Inc. | Value of customer relationships |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment of finite lived intangible assets |  | 2.5 |  |
Benefit Consultants Group Inc. | Retirement |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment | $ 2.0 |  |  |
Benefits Consultants Group System Inc. |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible assets |  | 5.0 |  |
NTA |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible assets |  | 160.4 |  |
Madison National |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible assets |  | $ 56.5 |  |

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