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Summary of Significant Accounting Policies (Details) - USD ($)
shares in Millions, $ in Billions
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2008
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2021
Related Parties [Line Items]            
Increase in net worth   $ 7.1        
Weighted average number of contingently issuable shares (shares)   4,700 4,700 4,700 4,700  
Convertible Preferred Stock, Shares Issued upon Conversion   26 26 26 26  
Preferred Stock | US Treasury            
Related Parties [Line Items]            
Shares issued (shares) 1          
Common Stock | US Treasury            
Related Parties [Line Items]            
Authorized proceeds from issuance of stock not requiring prior consent $ 70.0          
US Treasury            
Related Parties [Line Items]            
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement   $ 119.8   $ 119.8    
Total available funding from US Treasury pursuant to the senior preferred stock agreement   113.9   113.9    
Aggregate liquidation preference of senior preferred stock   $ 151.7   $ 151.7    
US Treasury | Forecast [Member]            
Related Parties [Line Items]            
Aggregate liquidation preference of senior preferred stock           $ 158.8