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Insurance Liabilities - Reconciliation of Unpaid Claims to Liability for Unpaid Claims Table (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid claims $ 1,393.2      
Reconciling items        
Reinsurance recoverable on unpaid claims 45.7      
Impact of discounting (209.4)      
Liability for unpaid claims - short duration contracts 1,229.5      
Insurance contracts other than short duration 1,603.6      
Liability for unpaid claims 2,833.1 $ 2,659.4 $ 2,534.9 $ 2,365.5
Long-Term Disability/Group Life Waiver        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid claims 1,240.3      
Reconciling items        
Reinsurance recoverable on unpaid claims 45.3      
Impact of discounting (209.4) (208.0)    
Liability for unpaid claims - short duration contracts 1,076.2 1,057.5    
Dental/Vision/Short-Term Disability/Critical Illness/Accident/PFML        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid claims 79.7      
Reconciling items        
Liability for unpaid claims - short duration contracts 79.7 73.1    
Group Life        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid claims 73.2      
Reconciling items        
Reinsurance recoverable on unpaid claims 0.4      
Liability for unpaid claims - short duration contracts $ 73.6 $ 80.2