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Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Jun. 11, 2018
Dec. 31, 2018
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 01, 2023
Jun. 15, 2023
Apr. 19, 2021
Feb. 22, 2021
Dec. 05, 2018
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Common Stock Aggregate Sale Price                 $ 750.0  
Proceeds from Issuance of Preferred Stock and Preference Stock     $ (393.9) $ 0.0 $ 0.0          
Preferred Stock, Par or Stated Value Per Share     $ 0.01 $ 0.01            
Net Process from Sale               $ 835.5    
Equity Units Stock Purchase Contract Liability Payment       $ 66.8            
Purchase Contract Liability     $ 0.0 $ 65.0 $ 129.4     $ 168.8    
Equity Units purchase contracts     29,800,000 30,200,000 22,000,000.0          
Excise and Sales Taxes     $ 3.6              
Preferred Stock, Shares Outstanding     40,000 1,302,500            
Series A Corporate Units                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Shares Issued, Price Per Share               $ 100    
Corporate Units Contract Annual Rate               7.75%    
Series A Preferred Stock                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Preferred Stock, Dividend Rate, Percentage 5.65%                  
Preferred Stock, Liquidation Preference Per Share     $ 1,000       $ 1,000      
Preferred Stock, Amount of Preferred Dividends in Arrears     $ 1.0              
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears     $ 2.51              
Preferred Stock, Liquidation Preference, Value     $ 400.0 $ 400.0 $ 400.0          
Preferred Stock, Par or Stated Value Per Share     $ 0.01              
Preferred Stock Shares Redeemed     400,000              
Preferred Stock, Redemption Amount     $ 400.0              
Preferred Stock, Shares Outstanding 400,000   0              
Series B Preferred Stock                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Preferred Stock, Dividend Rate, Percentage   6.50%                
Preferred Stock, Liquidation Preference Per Share     $ 25,000              
Preferred Stock, Dividend Rate, Initial Margin   3.632%                
Preferred Stock, Dividend Rate, Initial Margin Plus 1.000%   1.00%                
Preferred Stock, Amount of Preferred Dividends in Arrears     $ 1.4              
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears     $ 72.23              
Preferred Stock Depositary Shares Issued                   20,000,000
Preferred Stock, Liquidation Preference, Value     $ 500.0 $ 500.0 $ 500.0          
Depositary Stock Liquidation Preference     $ 25              
Preferred Stock, Shares Outstanding     20,000              
Series B-1 Preferred Stock                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Preferred Stock, Shares Issued     20,000              
Series C Preferred Stock                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Preferred Stock, Liquidation Preference Per Share     $ 1,000              
Preferred Stock, Liquidation Preference, Value     $ 863.0              
Preferred Stock, Par or Stated Value Per Share               $ 0.01    
Undivided Beneficial Ownership Interest, Percent               10.00%    
Common Stock, Shares, Issued           33,898,837        
Preferred Stock, Shares Outstanding     0              
Gross Proceeds | Series A Preferred Stock                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Proceeds from Issuance of Preferred Stock and Preference Stock $ 400.0                  
Gross Proceeds | Series B Preferred Stock                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Proceeds from Issuance of Preferred Stock and Preference Stock   $ 500.0                
Preferred Stock | Series A Preferred Stock                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Proceeds from Issuance of Preferred Stock and Preference Stock $ 393.9                  
Preferred Stock | Net Proceeds | Series B Preferred Stock                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Proceeds from Issuance of Preferred Stock and Preference Stock   $ 486.1