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Net Income Per Share (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 15, 2021
Dec. 31, 2021
Nov. 30, 2021
Dec. 31, 2020
Dec. 31, 2022
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       $ 1,291.04     $ 1,291.04 $ 1,347.29  
Payments for Repurchase of Preferred Stock and Preference Stock $ 1.1 $ 43.3 $ 42.2 $ 60.0 $ 0.0 $ 44.4 $ 61.6    
Conversion of Stock, Shares Converted         0        
Exercise price of warrant   $ 21.62       $ 21.62      
Exchange of preferred stock for common stock and common stock warrant           $ 0.0      
Preferred Stock Dividends and Other Adjustments         $ 0.0 37.6 $ 41.9    
Aggregate Value, Preferred Stock Transactions           $ 50.8      
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                 43.80
Preferred Stock, Par Value Per Share         $ 1.00        
Exchange of preferred stock for common stock and common stock warrant           $ 7.5      
Preferred Stock Dividends and Other Adjustments       $ 41.9   $ 37.6      
Warrant [Member]                  
Conversion of Stock, Shares Converted           250,000      
Preferred Series B [Member]                  
Stock Repurchased and Retired During Period, Shares           37,847 62,854    
Conversion of Stock, Shares Converted           3,873      
Preferred Stock, Liquidation Preference Per Share                 $ 1,000