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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
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