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Insurance Liabilities - Reconciliation of Unpaid Claims to Liability for Unpaid Claims Table (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid claims $ 1,372.3      
Reconciling items        
Reinsurance recoverable on unpaid claims 46.5      
Impact of discounting (208.0)      
Liability for unpaid claims - short duration contracts 1,210.8      
Insurance contracts other than short duration 1,448.6      
Liability for unpaid claims 2,659.4 $ 2,534.9 $ 2,365.5 $ 2,252.7
Long-Term Disability/Group Life Waiver        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid claims 1,219.0      
Reconciling items        
Reinsurance recoverable on unpaid claims 46.5      
Impact of discounting (208.0) (214.5)    
Liability for unpaid claims - short duration contracts 1,057.5 1,047.6    
Dental/Vision/Short-Term Disability/Critical Illness/Accident        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid claims 73.1      
Reconciling items        
Liability for unpaid claims - short duration contracts 73.1 70.4    
Group Life        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net outstanding liabilities for unpaid claims 80.2      
Reconciling items        
Liability for unpaid claims - short duration contracts $ 80.2 $ 54.1