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Goodwill and Intangible Assets - Schedule of Definite and Indefinite Life Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 758.0 | $ 750.9
Indefinite-lived Intangible Assets (Excluding Goodwill) | 49.4 | 49.4
Intangible Assets, Gross (Excluding Goodwill), Total | 807.4 | 800.3
Finite-Lived Intangible Assets, Accumulated Amortization | 491.9 | 482.0
Finite-Lived Intangible Assets, Net | 266.1 | 268.9
Intangible Assets, Net (Including Goodwill) | 315.5 | 318.3
Trade Names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | 5.2 | 5.2
Insurance Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | 44.2 | 44.2
Value of Business Acquired |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 237.5 | 237.5
Finite-Lived Intangible Assets, Accumulated Amortization | 225.4 | 223.7
Finite-Lived Intangible Assets, Net | 12.1 | 13.8
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 43.8 | 43.8
Finite-Lived Intangible Assets, Accumulated Amortization | 42.3 | 42.1
Finite-Lived Intangible Assets, Net | 1.5 | 1.7
Agent Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 81.6 | 81.6
Finite-Lived Intangible Assets, Accumulated Amortization | 43.9 | 38.2
Finite-Lived Intangible Assets, Net | 37.7 | 43.4
Trade Names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 0.0 | 0.0
Finite-Lived Intangible Assets, Accumulated Amortization | 0.0 | 0.0
Finite-Lived Intangible Assets, Net | 0.0 | 0.0
Internal Use Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 395.1 | 388.0
Finite-Lived Intangible Assets, Accumulated Amortization | 180.3 | 178.0
Finite-Lived Intangible Assets, Net | $ 214.8 | $ 210.0

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