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Future Policy Benefits and Claims - Claims Development Tables (Details)
$ in Millions
Dec. 31, 2024
USD ($)
claim
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Claims Development                    
Total outstanding liabilities for unpaid claims net of reinsurance $ 1,399.5                  
Long-Term Disability/Group Life Waiver                    
Claims Development                    
Net incurred claims 2,329.7                  
Net cumulative paid claims 1,343.1                  
Liability for unpaid claims net, not separately presented 249.3                  
Total outstanding liabilities for unpaid claims net of reinsurance 1,235.9                  
Long-Term Disability/Group Life Waiver | Incurral year 2015                    
Claims Development                    
Net incurred claims 208.5 $ 208.3 $ 210.5 $ 211.8 $ 210.0 $ 208.2 $ 215.3 $ 217.2 $ 227.2 $ 231.0
Incurred but not reported claims $ 0.1                  
Cumulative number of reported claims | claim 7,184                  
Net cumulative paid claims $ 166.5 160.3 154.0 146.5 137.1 126.8 114.6 98.0 67.0 $ 16.9
Long-Term Disability/Group Life Waiver | Incurral year 2016                    
Claims Development                    
Net incurred claims 218.0 219.0 221.9 218.7 214.4 219.5 219.4 228.4 229.8  
Incurred but not reported claims $ 0.1                  
Cumulative number of reported claims | claim 6,172                  
Net cumulative paid claims $ 171.5 165.3 157.1 147.2 136.8 124.9 105.6 70.6 $ 16.2  
Long-Term Disability/Group Life Waiver | Incurral year 2017                    
Claims Development                    
Net incurred claims 248.7 248.9 246.5 245.2 245.8 243.1 239.7 238.4    
Incurred but not reported claims $ 0.1                  
Cumulative number of reported claims | claim 6,092                  
Net cumulative paid claims $ 185.6 176.8 165.4 151.7 135.9 115.0 76.5 $ 17.8    
Long-Term Disability/Group Life Waiver | Incurral year 2018                    
Claims Development                    
Net incurred claims 241.9 238.0 235.3 239.8 239.2 245.1 239.4      
Incurred but not reported claims $ 0.1                  
Cumulative number of reported claims | claim 5,784                  
Net cumulative paid claims $ 173.3 163.3 150.3 135.7 115.7 79.9 $ 20.1      
Long-Term Disability/Group Life Waiver | Incurral year 2019                    
Claims Development                    
Net incurred claims 243.4 238.6 240.2 240.4 248.4 255.2        
Incurred but not reported claims $ 0.1                  
Cumulative number of reported claims | claim 5,962                  
Net cumulative paid claims $ 163.6 150.6 136.4 117.5 79.7 $ 19.2        
Long-Term Disability/Group Life Waiver | Incurral year 2020                    
Claims Development                    
Net incurred claims 211.3 217.7 221.1 231.0 252.1          
Incurred but not reported claims $ 0.1                  
Cumulative number of reported claims | claim 5,942                  
Net cumulative paid claims $ 140.8 130.0 113.1 78.8 $ 20.6          
Long-Term Disability/Group Life Waiver | Incurral year 2021                    
Claims Development                    
Net incurred claims 221.2 221.6 244.5 259.7            
Incurred but not reported claims $ 6.2                  
Cumulative number of reported claims | claim 5,586                  
Net cumulative paid claims $ 128.6 113.2 79.0 $ 19.8            
Long-Term Disability/Group Life Waiver | Incurral year 2022                    
Claims Development                    
Net incurred claims 227.6 240.5 274.3              
Incurred but not reported claims $ 8.5                  
Cumulative number of reported claims | claim 5,646                  
Net cumulative paid claims $ 111.4 76.6 $ 19.6              
Long-Term Disability/Group Life Waiver | Incurral year 2023                    
Claims Development                    
Net incurred claims 245.2 267.4                
Incurred but not reported claims $ 15.2                  
Cumulative number of reported claims | claim 5,354                  
Net cumulative paid claims $ 77.3 20.0                
Long-Term Disability/Group Life Waiver | Incurral year 2024                    
Claims Development                    
Net incurred claims 263.9                  
Incurred but not reported claims $ 96.7                  
Cumulative number of reported claims | claim 2,953                  
Net cumulative paid claims $ 24.5                  
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML                    
Claims Development                    
Net incurred claims 2,151.4                  
Net cumulative paid claims 2,061.2                  
Total outstanding liabilities for unpaid claims net of reinsurance 90.2                  
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML | Incurral year 2023                    
Claims Development                    
Net incurred claims $ 1,022.1 1,032.3                
Cumulative number of reported claims | claim 4,774,225                  
Net cumulative paid claims $ 1,021.3 954.0                
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML | Incurral year 2024                    
Claims Development                    
Net incurred claims 1,129.3                  
Incurred but not reported claims $ 66.9                  
Cumulative number of reported claims | claim 4,787,967                  
Net cumulative paid claims $ 1,039.9                  
Group Life                    
Claims Development                    
Net incurred claims 568.2                  
Net cumulative paid claims 500.9                  
Liability for unpaid claims net, not separately presented 6.1                  
Total outstanding liabilities for unpaid claims net of reinsurance 73.4                  
Group Life | Incurral year 2023                    
Claims Development                    
Net incurred claims 283.1 284.8                
Incurred but not reported claims $ 0.9                  
Cumulative number of reported claims | claim 5,814                  
Net cumulative paid claims $ 277.2 $ 215.1                
Group Life | Incurral year 2024                    
Claims Development                    
Net incurred claims 285.1                  
Incurred but not reported claims $ 29.6                  
Cumulative number of reported claims | claim 5,265                  
Net cumulative paid claims $ 223.7