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Short-Duration Insurance Contracts - Incurred and Paid Claims by Accident Year on a Net Basis (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 ($)
Dec. 31, 2015
USD ($)
Homeowners                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 1,449.4                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,386.1                  
Outstanding prior to 2015 0.0                  
Prior years paid 0.0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 63.3                  
Homeowners | 2015                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 114.9 $ 114.9 $ 114.9 $ 114.9 $ 114.9 $ 115.1 $ 114.1 $ 114.4 $ 115.1 $ 111.7
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 18,176                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 114.9 114.9 114.7 114.7 114.9 114.6 113.3 111.9 109.3 90.7
Homeowners | 2016                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 $ 118.1 118.1 118.0 117.8 117.7 117.5 115.1 113.2 95.8  
Homeowners | 2017                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 19,867                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 131.2 131.2 130.7 130.5 130.0 129.8 128.5 106.8    
Homeowners | 2018                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 21,150                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 156.3 156.2 157.2 157.4 157.0 152.4 130.5      
Homeowners | 2019                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 $ 0.3                  
Cumulative Number of Reported Claims | claim 17,578                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 130.8 130.4 130.0 129.1 126.2 103.8        
Homeowners | 2020                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 146.1 146.9 145.4 151.9 155.7          
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.6                  
Cumulative Number of Reported Claims | claim 19,731                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 145.8 145.6 144.0 138.7 106.8          
Homeowners | 2021                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 154.4 154.3 150.7 150.2            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 1.0                  
Cumulative Number of Reported Claims | claim 16,683                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 152.5 151.0 146.3 114.9            
Homeowners | 2022                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 152.1 156.2 162.2              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 2.4                  
Cumulative Number of Reported Claims | claim 14,581                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 149.3 144.8 108.3              
Homeowners | 2023                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 172.6 183.1                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 9.2                  
Cumulative Number of Reported Claims | claim 16,622                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 161.7 126.3                
Homeowners | 2024                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 172.7                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 33.1                  
Cumulative Number of Reported Claims | claim 15,568                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 125.5                  
Automobile Liability                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,735.5                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,539.4                  
Outstanding prior to 2015 0.9                  
Prior years paid                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 197.0                  
Automobile Liability | 2015                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 178.9 178.9 178.8 178.9 179.2 178.7 178.3 177.0 172.6 165.5
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.1                  
Cumulative Number of Reported Claims | claim 50,638                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 178.7 178.6 178.3 177.7 176.7 174.5 170.1 158.0 134.5 70.8
Automobile Liability | 2016                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 $ 189.5 189.4 189.0 188.1 184.5 177.8 166.8 140.9 73.1  
Automobile Liability | 2017                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 $ 192.1 191.8 190.8 185.8 179.8 166.6 139.5 70.7    
Automobile Liability | 2018                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 $ 0.6                  
Cumulative Number of Reported Claims | claim 47,514                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 191.5 190.6 188.0 180.7 168.6 141.5 77.5      
Automobile Liability | 2019                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 $ 1.7                  
Cumulative Number of Reported Claims | claim 46,313                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 178.6 176.2 170.9 155.5 129.1 69.7        
Automobile Liability | 2020                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 32,121                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 133.3 129.2 118.2 94.0 51.5          
Automobile Liability | 2021                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 154.7 156.7 157.8 142.2            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 5.0                  
Cumulative Number of Reported Claims | claim 34,499                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 145.3 136.5 112.5 52.9            
Automobile Liability | 2022                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 161.1 166.1 165.6              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 11.8                  
Cumulative Number of Reported Claims | claim 32,151                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 140.5 116.7 55.8              
Automobile Liability | 2023                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 173.0 176.4                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 29.4                  
Cumulative Number of Reported Claims | claim 32,081                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 123.1 62.2                
Automobile Liability | 2024                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 175.6                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 65.1                  
Cumulative Number of Reported Claims | claim 30,126                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 66.8                  
Auto physical damage                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,112.6                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 1,102.8                  
Outstanding prior to 2015 0.0                  
Prior years paid 0.0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 9.8                  
Auto physical damage | 2015                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 97.6 97.6 97.6 97.6 97.6 97.6 97.5 97.6 98.0 99.3
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 87,506                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 97.6 97.6 97.6 97.6 97.6 97.6 97.6 97.7 97.9 92.1
Auto physical damage | 2016                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 $ 109.5 109.5 109.5 109.6 109.6 109.6 109.5 109.7 106.5  
Auto physical damage | 2017                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 $ 110.6 110.6 110.6 110.6 110.6 110.7 110.8 105.2    
Auto physical damage | 2018                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 94,483                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 108.2 108.2 108.2 108.3 108.3 109.1 103.6      
Auto physical damage | 2019                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 92,213                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 110.0 110.1 110.1 110.1 110.7 106.2        
Auto physical damage | 2020                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 68,845                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 87.3 87.3 87.4 87.6 84.1          
Auto physical damage | 2021                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 105.4 105.1 105.7 105.0            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ (0.1)                  
Cumulative Number of Reported Claims | claim 72,727                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 105.4 105.4 105.8 97.3            
Auto physical damage | 2022                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 124.0 125.5 125.7              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.1                  
Cumulative Number of Reported Claims | claim 72,982                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 123.8 124.3 114.6              
Auto physical damage | 2023                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 129.4 132.4                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ (0.6)                  
Cumulative Number of Reported Claims | claim 72,436                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 129.9 122.0                
Auto physical damage | 2024                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 130.5                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ (1.7)                  
Cumulative Number of Reported Claims | claim 67,607                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 120.5                  
Specialty Health                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 137.3                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 130.0                  
Outstanding prior to 2015 0.0                  
Prior years paid 0.0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 7.3                  
Specialty Health | 2015                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 30.4 30.4 30.4 30.4 30.4 30.3 30.3 30.3 30.9 33.3
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 183,433                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 30.4 30.4 30.4 30.4 30.4 30.3 30.3 30.3 30.4 24.9
Specialty Health | 2016                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.2 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 11.0 5.5  
Specialty Health | 2017                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 9.4 7.3    
Specialty Health | 2018                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 95,219                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 12.6 12.6 12.6 12.6 12.5 12.1 8.8      
Specialty Health | 2019                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 72,759                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 9.5 9.5 9.5 9.5 9.3 7.5        
Specialty Health | 2020                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 43,616                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 5.7 5.7 5.7 5.6 4.2          
Specialty Health | 2021                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 15.3 16.1 17.7 22.8            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.1                  
Cumulative Number of Reported Claims | claim 73,152                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 15.2 13.7 12.9 2.9            
Specialty Health | 2022                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 17.7 18.0 22.6              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.5                  
Cumulative Number of Reported Claims | claim 121,749                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 17.2 16.7 10.5              
Specialty Health | 2023                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 14.1 16.0                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 1.3                  
Cumulative Number of Reported Claims | claim 99,201                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 12.9 8.8                
Specialty Health | 2024                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 11.3                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 5.5                  
Cumulative Number of Reported Claims | claim 32,041                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 5.8                  
Group Disability                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 293.7                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 222.0                  
Outstanding prior to 2015 6.2                  
Prior years paid 114.9                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 77.9                  
Effect of discounting (14.6)                  
Discounted net reserves 63.3                  
Group Disability | 2015                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 14.0 14.5 14.7 15.2 15.2 14.6 14.7 16.6 19.2 25.3
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.0                  
Cumulative Number of Reported Claims | claim 3,347                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 19.4 19.1 18.9 18.6 18.1 17.6 17.2 16.6 14.0 $ 6.8
Group Disability | 2016                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 $ 23.3 22.9 22.4 21.8 21.1 20.3 19.3 16.4 $ 8.3  
Group Disability | 2017                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 $ 19.9 19.7 19.4 18.9 18.3 17.9 16.1 $ 8.5    
Group Disability | 2018                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 $ 0.5                  
Cumulative Number of Reported Claims | claim 4,175                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 20.3 20.1 19.6 18.9 18.0 16.1 $ 8.4      
Group Disability | 2019                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 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 $ 0.2                  
Cumulative Number of Reported Claims | claim 4,560                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 25.7 25.2 24.7 24.3 22.8 $ 11.8        
Group Disability | 2020                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 32.4 33.2 34.1 34.3 36.7          
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.2                  
Cumulative Number of Reported Claims | claim 4,357                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 26.9 26.4 25.5 22.7 $ 12.4          
Group Disability | 2021                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 37.3 41.3 41.3 37.8            
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.4                  
Cumulative Number of Reported Claims | claim 5,118                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 27.4 26.7 24.0 $ 11.8            
Group Disability | 2022                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 31.0 32.0 39.2              
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 0.6                  
Cumulative Number of Reported Claims | claim 4,368                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 23.7 21.4 $ 11.7              
Group Disability | 2023                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 36.5 40.3                
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 1.9                  
Cumulative Number of Reported Claims | claim 4,410                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 22.4 $ 12.2                
Group Disability | 2024                    
2024                    
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 38.7                  
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims $ 12.1                  
Cumulative Number of Reported Claims | claim 3,589                  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance $ 13.0