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Future Policy Benefits and Claims - Discounting Table (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Short-Duration Insurance Contracts, Discounted Liabilities [Line Items]      
Carrying amount of liabilities for unpaid claims $ 1,240.3    
Aggregate amount of discount $ 226.6    
Short-Duration Insurance Contract, Discounted Liability, Interest Accretion, Statement of Income or Comprehensive Income [Extensible Enumeration] Policyholder Benefits and Claims Incurred, Net Policyholder Benefits and Claims Incurred, Net Policyholder Benefits and Claims Incurred, Net
Long-Term Disability/Group Life Waiver      
Short-Duration Insurance Contracts, Discounted Liabilities [Line Items]      
Carrying amount of liabilities for unpaid claims $ 1,062.1 $ 1,082.6  
Aggregate amount of discount 226.6 215.0  
Interest accretion $ 34.7 $ 34.7 $ 33.0
Long-Term Disability/Group Life Waiver | Minimum      
Short-Duration Insurance Contracts, Discounted Liabilities [Line Items]      
Discount rate 2.80% 2.80%  
Long-Term Disability/Group Life Waiver | Maximum      
Short-Duration Insurance Contracts, Discounted Liabilities [Line Items]      
Discount rate 7.00% 7.00%  
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML      
Short-Duration Insurance Contracts, Discounted Liabilities [Line Items]      
Carrying amount of liabilities for unpaid claims $ 94.3 $ 83.7  
Group Life      
Short-Duration Insurance Contracts, Discounted Liabilities [Line Items]      
Carrying amount of liabilities for unpaid claims $ 83.9 $ 97.1