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Insurance Liabilities - Discounting Table (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Short-duration Insurance Contracts, Discounted Liabilities [Line Items]      
Carrying amount of liabilities for unpaid claims $ 1,229.5    
Aggregate amount of discount 209.4    
Long-Term Disability/Group Life Waiver      
Short-duration Insurance Contracts, Discounted Liabilities [Line Items]      
Carrying amount of liabilities for unpaid claims 1,076.2 $ 1,057.5  
Aggregate amount of discount 209.4 208.0  
Interest accretion $ 33.0 $ 33.8 $ 33.9
Short-Duration Insurance Contract, Discounted Liability, Interest Accretion, Statement of Financial Position [Extensible Enumeration] Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense
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/Short-Term Disability/Critical Illness/Accident/PFML      
Short-duration Insurance Contracts, Discounted Liabilities [Line Items]      
Carrying amount of liabilities for unpaid claims $ 79.7 $ 73.1  
Group Life      
Short-duration Insurance Contracts, Discounted Liabilities [Line Items]      
Carrying amount of liabilities for unpaid claims $ 73.6 $ 80.2