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Equity (Schedule of Stock by Class - Preferred) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jun. 15, 2023
Jun. 11, 2018
Class of Stock [Line Items]          
Preferred Stock, Shares Outstanding 40,000 1,302,500      
Preferred Stock, Value, Outstanding $ 486.1 $ 1,546.5      
Series A Preferred Stock          
Class of Stock [Line Items]          
Preferred Stock, Liquidation Preference Per Share $ 1,000     $ 1,000  
Preferred Stock, Shares Outstanding 0       400,000
Preferred Stock, Dividends Per Share, Declared $ 28.25 $ 56.50 $ 56.50    
Preferred Stock, Value, Outstanding $ 0.0 $ 393.9      
Series B Preferred Stock          
Class of Stock [Line Items]          
Preferred Stock, Liquidation Preference Per Share $ 25,000        
Preferred Stock, Shares Outstanding 20,000        
Preferred Stock, Dividends Per Share, Declared $ 1,625 $ 1,625 1,625    
Preferred Stock, Value, Outstanding $ 486.1 $ 486.1      
Series C Preferred Stock          
Class of Stock [Line Items]          
Preferred Stock, Liquidation Preference Per Share $ 1,000        
Preferred Stock, Shares Outstanding 0        
Preferred Stock, Dividends Per Share, Declared $ 0 $ 0 $ 0    
Preferred Stock, Value, Outstanding $ 0.0 $ 666.5