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Equity (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
May 22, 2024
Feb. 22, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Feb. 23, 2024
Mar. 15, 2024
Dec. 31, 2023
Dec. 01, 2023
Jun. 15, 2023
Preferred Stock, Shares Authorized     20,000,000   20,000,000       20,000,000    
Preferred Stock, Shares Outstanding     0   0       40,000    
Preferred Stock, Par or Stated Value Per Share     $ 0.01   $ 0.01     $ 25,000 $ 0.01 $ 0.01  
Preferred Stock Shares Redeemed         0            
Common Stock, Shares, Issued                   33,898,837  
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share $ 28.87   $ 25.78   $ 28.79   $ 25.78        
Preferred Stock, Liquidation Preference Per Share                     $ 1,000
Preferred Stock Redemption Premium     $ 0 $ 6,200,000 $ 14,000,000.0 $ 6,200,000          
Pension Plan                      
Defined Benefit Plan, Plan Assets, Contributions by Employer         1,300,000 2,000,000          
Other Postretirement Benefit Plan                      
Defined Benefit Plan, Plan Assets, Contributions by Employer         10,700,000 $ 11,200,000          
At The Market Program                      
Common Stock Aggregate Sale Price   $ 900,000,000.0                  
ATM Program Equity Remaining Available for Issuance         $ 400.0            
Forward February 23                      
Common Stock Aggregate Sale Price     $ 200,000,000                
Forward Contract Indexed to Issuer's Equity, Shares             7,757,951        
Series A Preferred Stock                      
Preferred Stock, Shares Outstanding                     400,000
Preferred Stock, Redemption Amount                     $ 400,000,000
Preferred Stock, Dividends Per Share, Declared       $ 28.25 $ 0            
Series B Preferred Stock [Member]                      
Preferred Stock, Dividends Per Share, Declared     $ 0 $ 406.25 $ 406.25 $ 1,218.75          
Preferred Stock Redemption Premium         $ 14,000,000            
Series B-1 Preferred Stock                      
Preferred Stock, Par or Stated Value Per Share               $ 0.01      
Preferred Stock, Redemption Amount               $ 500,000,000      
Preferred Stock, Shares Issued     20,000   20,000     20,000