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Short-Duration Insurance Contracts - Incurred and Paid Claims by Accident Year on a Net Basis (Details)
$ in Millions
Dec. 31, 2025
USD ($)
claim
Dec. 31, 2024
USD ($)
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 ($)
Dec. 31, 2016
USD ($)
Homeowners                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 1,468.2                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,416.4                  
Outstanding prior to 2016 0.0                  
Prior years paid 0.0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 51.8                  
Homeowners | 2016                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 118.1 $ 118.1 $ 118.1 $ 118.1 $ 117.9 $ 117.9 $ 117.9 $ 117.0 $ 118.6 $ 115.9
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 19,866                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 118.1 118.1 118.1 118.0 117.8 117.7 117.5 115.1 113.2 95.8
Homeowners | 2017                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 131.3 131.1 131.3 130.8 130.8 130.7 132.7 129.8 126.3  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 19,868                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 131.3 131.2 131.2 130.7 130.5 130.0 129.8 128.5 106.8  
Homeowners | 2018                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 156.4 156.1 156.0 157.2 158.1 158.9 157.4 166.8    
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 21,152                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 156.4 156.3 156.2 157.2 157.4 157.0 152.4 130.5    
Homeowners | 2019                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 132.0 131.3 131.1 130.9 132.1 129.9 130.4      
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 17,585                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 132.0 130.8 130.4 130.0 129.1 126.2 103.8      
Homeowners | 2020                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 145.9 146.1 146.9 145.4 151.9 155.7        
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.3                  
Cumulative Number of Reported Claims | claim 19,733                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 145.6 145.8 145.6 144.0 138.7 106.8        
Homeowners | 2021                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 154.1 154.4 154.3 150.7 150.2          
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.5                  
Cumulative Number of Reported Claims | claim 16,691                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 153.6 152.5 151.0 146.3 114.9          
Homeowners | 2022                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 152.3 152.1 156.2 162.2            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 2.3                  
Cumulative Number of Reported Claims | claim 14,600                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 149.8 149.3 144.8 108.3            
Homeowners | 2023                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 172.2 172.6 183.1              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 6.6                  
Cumulative Number of Reported Claims | claim 16,682                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 165.1 161.7 126.3              
Homeowners | 2024                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 163.1 172.7                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 7.2                  
Cumulative Number of Reported Claims | claim 16,571                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 154.8 125.5                
Homeowners | 2025                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 142.8                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 19.2                  
Cumulative Number of Reported Claims | claim 11,332                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 109.7                  
Automobile Liability                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,738.5                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,532.0                  
Outstanding prior to 2016 0.8                  
Prior years paid                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 207.3                  
Automobile Liability | 2016                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 189.7 189.7 189.5 189.6 189.2 188.1 186.6 184.6 184.4 180.4
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.2                  
Cumulative Number of Reported Claims | claim 52,053                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 189.5 189.5 189.4 189.0 188.1 184.5 177.8 166.8 140.9 73.1
Automobile Liability | 2017                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 192.6 192.5 192.5 192.9 191.7 189.1 188.6 188.8 188.0  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.2                  
Cumulative Number of Reported Claims | claim 49,021                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 192.2 192.1 191.8 190.8 185.8 179.8 166.6 139.5 70.7  
Automobile Liability | 2018                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 192.3 192.3 192.3 192.0 189.8 192.9 195.3 200.3    
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.4                  
Cumulative Number of Reported Claims | claim 47,515                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 191.7 191.5 190.6 188.0 180.7 168.6 141.5 77.5    
Automobile Liability | 2019                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 181.3 181.0 181.2 181.5 176.7 180.1 181.1      
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 1.3                  
Cumulative Number of Reported Claims | claim 46,318                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 179.3 178.6 176.2 170.9 155.5 129.1 69.7      
Automobile Liability | 2020                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 136.8 136.7 137.3 136.3 134.9 137.0        
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 2.1                  
Cumulative Number of Reported Claims | claim 32,130                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 134.4 133.3 129.2 118.2 94.0 51.5        
Automobile Liability | 2021                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 154.5 154.7 156.7 157.8 142.2          
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 3.3                  
Cumulative Number of Reported Claims | claim 34,519                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 149.4 145.3 136.5 112.5 52.9          
Automobile Liability | 2022                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 160.9 161.1 166.1 165.6            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 7.4                  
Cumulative Number of Reported Claims | claim 32,206                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 150.1 140.5 116.7 55.8            
Automobile Liability | 2023                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 170.0 173.0 176.4              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 15.5                  
Cumulative Number of Reported Claims | claim 32,228                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 146.8 123.1 62.2              
Automobile Liability | 2024                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 178.0 175.6                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 25.2                  
Cumulative Number of Reported Claims | claim 32,060                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 133.3 66.8                
Automobile Liability | 2025                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 182.4                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 73.1                  
Cumulative Number of Reported Claims | claim 29,304                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 65.3                  
Auto physical damage                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,128.7                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,122.4                  
Outstanding prior to 2016 0.0                  
Prior years paid 0.0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 6.3                  
Auto physical damage | 2016                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 109.5 109.5 109.6 109.5 109.5 109.6 109.6 109.3 109.5 112.4
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 93,234                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 109.5 109.5 109.5 109.5 109.6 109.6 109.6 109.5 109.7 106.5
Auto physical damage | 2017                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 110.6 110.6 110.6 110.6 110.5 110.6 110.5 111.8 115.5  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 91,302                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 110.6 110.6 110.6 110.6 110.6 110.6 110.7 110.8 105.2  
Auto physical damage | 2018                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 108.2 108.3 108.3 108.2 108.3 108.3 108.9 109.0    
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 94,484                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 108.2 108.2 108.2 108.2 108.3 108.3 109.1 103.6    
Auto physical damage | 2019                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 110.0 110.0 109.9 110.0 110.0 110.5 111.6      
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 92,214                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 110.0 110.0 110.1 110.1 110.1 110.7 106.2      
Auto physical damage | 2020                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 87.3 87.3 87.0 87.1 86.9 87.0        
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 68,844                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 87.3 87.3 87.3 87.4 87.6 84.1        
Auto physical damage | 2021                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 105.4 105.4 105.1 105.7 105.0          
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 72,731                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 105.4 105.4 105.4 105.8 97.3          
Auto physical damage | 2022                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 123.9 124.0 125.5 125.7            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 73,001                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 123.8 123.8 124.3 114.6            
Auto physical damage | 2023                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 129.7 129.4 132.4              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 72,502                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 129.6 129.9 122.0              
Auto physical damage | 2024                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 124.7 130.5                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ (0.5)                  
Cumulative Number of Reported Claims | claim 69,524                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 125.1 120.5                
Auto physical damage | 2025                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 119.4                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ (5.7)                  
Cumulative Number of Reported Claims | claim 60,121                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 112.9                  
Specialty Health                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 111.6                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 105.4                  
Outstanding prior to 2016 0.0                  
Prior years paid 0.0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 6.2                  
Specialty Health | 2016                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.2 12.5
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 67,274                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.0 5.5
Specialty Health | 2017                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.7 10.6  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 63,494                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 9.6 9.6 9.6 9.6 9.6 9.6 9.6 9.4 7.3  
Specialty Health | 2018                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 12.6 12.6 12.6 12.6 12.7 13.0 13.2 12.9    
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 95,220                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 12.6 12.6 12.6 12.6 12.6 12.5 12.1 8.8    
Specialty Health | 2019                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 9.5 9.5 9.5 9.5 9.6 9.5 10.6      
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 72,761                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 9.5 9.5 9.5 9.5 9.5 9.3 7.5      
Specialty Health | 2020                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 5.7 5.7 5.7 5.7 5.8 6.8        
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 43,619                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 5.7 5.7 5.7 5.7 5.6 4.2        
Specialty Health | 2021                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 15.2 15.3 16.1 17.7 22.8          
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 73,159                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 15.2 15.2 13.7 12.9 2.9          
Specialty Health | 2022                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 17.4 17.7 18.0 22.6            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 121,940                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 17.4 17.2 16.7 10.5            
Specialty Health | 2023                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 13.2 14.1 16.0              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.1                  
Cumulative Number of Reported Claims | claim 99,583                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 13.1 12.9 8.8              
Specialty Health | 2024                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 8.5 11.3                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.5                  
Cumulative Number of Reported Claims | claim 51,080                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 8.0 5.8                
Specialty Health | 2025                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 8.8                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 5.5                  
Cumulative Number of Reported Claims | claim 37,569                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 3.2                  
Group Disability                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 326.6                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 232.8                  
Outstanding prior to 2016 (5.6)                  
Prior years paid 136.2                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 88.2                  
Effect of discounting (17.9)                  
Discounted net reserves 70.3                  
Group Disability | 2016                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 26.9 26.9 28.1 28.1 26.8 26.3 26.0 27.4 28.6 28.5
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 3,619                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 23.8 23.3 22.9 22.4 21.8 21.1 20.3 19.3 16.4 $ 8.3
Group Disability | 2017                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 22.8 22.7 23.1 24.0 23.3 22.4 22.9 26.0 29.9  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 3,906                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 20.1 19.9 19.7 19.4 18.9 18.3 17.9 16.1 $ 8.5  
Group Disability | 2018                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 23.5 23.8 23.6 23.3 22.7 23.2 26.6 29.8    
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 4,175                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 20.6 20.3 20.1 19.6 18.9 18.0 16.1 $ 8.4    
Group Disability | 2019                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 30.9 30.4 30.2 29.9 30.2 33.5 34.5      
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.4                  
Cumulative Number of Reported Claims | claim 4,563                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 26.2 25.7 25.2 24.7 24.3 22.8 $ 11.8      
Group Disability | 2020                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 32.9 32.4 33.2 34.1 34.3 36.7        
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.1                  
Cumulative Number of Reported Claims | claim 4,367                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 27.3 26.9 26.4 25.5 22.7 $ 12.4        
Group Disability | 2021                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 37.3 37.3 41.3 41.3 37.8          
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.2                  
Cumulative Number of Reported Claims | claim 5,144                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 28.1 27.4 26.7 24.0 $ 11.8          
Group Disability | 2022                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 30.7 31.0 32.0 39.2            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.5                  
Cumulative Number of Reported Claims | claim 4,378                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 24.6 23.7 21.4 $ 11.7            
Group Disability | 2023                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 34.3 36.5 40.3              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.6                  
Cumulative Number of Reported Claims | claim 4,432                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 24.6 22.4 $ 12.2              
Group Disability | 2024                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 44.0 38.7                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 1.9                  
Cumulative Number of Reported Claims | claim 4,485                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 24.0 $ 13.0                
Group Disability | 2025                    
2025                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 43.3                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 14.3                  
Cumulative Number of Reported Claims | claim 3,557                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 13.5