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Statutory Financial Information of Insurance Subsidiaries (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Property and Casualty Insurance [Member] | Repwest [Member]        
Statutory financial information of insurance subsidiaries:        
Statutory accounting practices, statutory amount available for dividend payments     $ 22.7  
Dividend payments restrictions schedule, amounts paid $ 22.6 $ 21.6    
Restricted net assets, subsidiaries     105.4 $ 98.5
Life Insurance [Member] | Oxford [Member]        
Statutory financial information of insurance subsidiaries:        
Statutory accounting practices, statutory amount available for dividend payments     $ 6.3