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Investments - Narrative (Details) - USD ($)
3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Debt Securities, Available-for-sale [Line Items]      
Accrued interest $ 2,000,000   $ 2,100,000
Unrealized losses of debt securities 24,019,000   20,494,000
Impairment on debt securities 0    
Debt securities credit losses 0 $ 0  
Fair value of debt securities which no credit losses were recognized 666,200,000    
Impairment on debt securities during period   0  
Available-for-sale Securities      
Debt Securities, Available-for-sale [Line Items]      
Unrealized losses of debt securities $ 24,019,000 $ 0 $ 20,494,000