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Reinsurance (Cumulative Incurred Claims) (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cumulative Incurred Claims [Line Items]          
Cumulative Incurred Claims $ 223,800,000        
Claims Reserve $ 5,600,000        
Cumulative Number Of Reported Claims 148,443        
Incident Year - Four Years Prior [Member]          
Cumulative Incurred Claims [Line Items]          
Cumulative Incurred Claims $ 30,200,000 $ 30,200,000 $ 30,200,000 $ 30,200,000 $ 30,100,000
Claims Reserve $ 0        
Cumulative Number Of Reported Claims 24,422        
Incident Year - Three Years Prior [Member]          
Cumulative Incurred Claims [Line Items]          
Cumulative Incurred Claims $ 37,700,000 37,700,000 37,600,000 $ 37,700,000  
Claims Reserve $ 0        
Cumulative Number Of Reported Claims 28,208        
Incident Year - Two Years Prior [Member]          
Cumulative Incurred Claims [Line Items]          
Cumulative Incurred Claims $ 39,300,000 39,200,000 $ 38,900,000    
Claims Reserve $ 0        
Cumulative Number Of Reported Claims 28,834        
Incident Year - Prior Year [Member]          
Cumulative Incurred Claims [Line Items]          
Cumulative Incurred Claims $ 47,700,000 $ 46,000,000.0      
Claims Reserve $ 0        
Cumulative Number Of Reported Claims 30,441        
Incident Year - Current Year [Member]          
Cumulative Incurred Claims [Line Items]          
Cumulative Incurred Claims $ 68,900,000        
Claims Reserve $ 5,600,000        
Cumulative Number Of Reported Claims 36,538