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Equity Schedule of Stock by Class - Preferred (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended
Jun. 11, 2018
Dec. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Class of Stock [Line Items]          
Preferred Stock, Shares Outstanding     440,000   440,000
Shares outstanding   $ 5,750.9 $ 5,741.4 $ 5,779.6 $ 5,986.7
Series A Preferred Stock          
Class of Stock [Line Items]          
Preferred Stock, Liquidation Preference Per Share     $ 1,000.00    
Preferred Stock, Shares Outstanding     400,000    
Dividends Declared Per Share     $ 28.25 $ 28.25  
Series B Preferred Stock          
Class of Stock [Line Items]          
Preferred Stock, Liquidation Preference Per Share     $ 25,000.00    
Preferred Stock, Shares Outstanding     20,000    
Dividends Declared Per Share     $ 812.50 $ 862.15  
Series B-1 Preferred Stock          
Class of Stock [Line Items]          
Preferred Stock, Shares Outstanding     20,000    
Preferred Stock          
Class of Stock [Line Items]          
Shares outstanding   880.0 [1] $ 880.0 [1] $ 880.0 [1] 880.0
Preferred Stock | Series A Preferred Stock          
Class of Stock [Line Items]          
Issuance of preferred stock, net of issuance costs $ 393.9        
Shares outstanding         393.9
Preferred Stock | Series B Preferred Stock          
Class of Stock [Line Items]          
Shares outstanding         $ 486.1
Net Proceeds [Member] | Preferred Stock | Series B Preferred Stock          
Class of Stock [Line Items]          
Issuance of preferred stock, net of issuance costs   $ 486.1      
[1] Series A and Series B shares have an aggregate liquidation preference of $400M and $500M, respectively. See Note 5, "Equity" for additional information.