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Net Income Per Share (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 15, 2021
Dec. 31, 2021
Nov. 30, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Stock Repurchase Price per Share   $ 1,149.99            
Preferred Stock, Liquidation Amount per Share   1,347.29   $ 1,291.04 $ 1,347.29 $ 1,291.04    
Payments for Repurchase of Preferred Stock and Preference Stock $ 1,100,000 $ 43,300,000 $ 42,200,000 $ 60,000,000 $ 44,400,000 $ 61,600,000    
Conversion of Stock, Shares Converted         0 398,262    
Preferred Stock, Par Value Per Share   $ 1.00   $ 1.00 $ 1.00 $ 1.00 $ 1.00  
Exercise price of warrant   21.62   21.62 $ 21.62 $ 21.62    
Exchange of preferred stock for common stock and common stock warrant         $ 0      
Preferred Stock, Liquidation Preference Per Share   $ 1,000     $ 1,000      
Preferred Stock Dividends and Other Adjustments         $ 37,600,000 $ 41,900,000    
Aggregate Value, Preferred Stock Transactions         $ 50,800,000      
Common Class A [Member]                
Conversion of Stock, Shares Converted     231,276   231,276 398,262    
Series B Preferred Stock [Member]                
Stock Repurchased and Retired During Period, Shares   980 36,867     62,854    
Stock Repurchase Price per Share     $ 1,145.2     $ 954.59    
Preferred Stock, Liquidation Amount per Share               $ 1,272.78
Preferred Stock, Carrying Value per Share               $ 43.8
Preferred Stock, Par Value Per Share       $ 1.00   $ 1.00    
Exchange of preferred stock for common stock and common stock warrant         $ 7,500,000      
Preferred Stock Dividends and Other Adjustments       $ 41,900,000        
Warrant [Member]                
Conversion of Stock, Shares Converted         250,000