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Investments - Narrative (Details) - USD ($)
6 Months Ended 9 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Schedule of Investments [Line Items]        
Realized gains (losses) on investments still held at the reporting date    
Fair value of collateral posted    
Gain (loss) recognized in the income statement    
Gain (loss) recognized in other comprehensive income    
Gains (losses) reclassified from other comprehensive income into shareholders' net income    
Amounts excluded from assessment of hedge effectiveness    
Amount of impairments or value changes resulting from observable price changes on equity securities with no readily available fair value still held