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Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Jun. 11, 2018
Sep. 01, 2021
Dec. 31, 2018
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jun. 15, 2023
Apr. 19, 2021
Feb. 22, 2021
Aug. 01, 2019
Dec. 05, 2018
Nov. 01, 2018
Forward Contract Indexed to Issuer's Equity [Line Items]                        
Common Stock Aggregate Sale Price                 $ 750.0 $ 434.4   $ 500.0
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 $ 41.2              
Purchase Contract Liability       $ 65.0 $ 129.4 $ 0.0   $ 168.8        
Equity Units purchase contracts       30,200,000 22,000,000.0 0            
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit purchase contract payment balance       2,500,000                
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%        
Shares To Be Issued Under Stock Purchase Contracts       35,200,000                
Series C Preferred Stock                        
Forward Contract Indexed to Issuer's Equity [Line Items]                        
Shares To Be Issued Under Stock Purchase Contracts       35,200,000                
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                
Preferred Stock, Dividend Rate, Initial Margin 2.843%                      
Preferred Stock, Dividend Rate, Initial Margin Plus 1.000% 1.00%                      
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            
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                
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%        
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                  
Forward August 2021                        
Forward Contract Indexed to Issuer's Equity [Line Items]                        
Forward Contract Indexed to Issuer's Equity, Shares   5,941,598                    
Derivative, Forward Price   $ 25.25   $ 23.90                
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value       $ 142.0                
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                  
At The Market Program                        
Forward Contract Indexed to Issuer's Equity [Line Items]                        
ATM Program Equity Remaining Available for Issuance       $ 300.0                
Subsequent Event | Series A Preferred Stock                        
Forward Contract Indexed to Issuer's Equity [Line Items]                        
Preferred Stock, Liquidation Preference Per Share             $ 1,000