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Equity (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Feb. 22, 2024
Mar. 31, 2024
Mar. 31, 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    
Preferred Stock, Shares Outstanding   0       40,000    
Preferred Stock, Par or Stated Value Per Share   $ 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   $ 25.76   $ 25.78        
Preferred Stock, Liquidation Preference Per Share               $ 1,000
Preferred Stock Redemption Premium   $ 14,000,000.0 $ 0          
Pension Plan                
Defined Benefit Plan, Plan Assets, Contributions by Employer   700,000 1,200,000          
Other Postretirement Benefit Plan                
Defined Benefit Plan, Plan Assets, Contributions by Employer   5,400,000 $ 5,600,000          
At The Market Program                
Common Stock Aggregate Sale Price $ 900,000,000 199,800,000            
ATM Program Equity Remaining Available for Issuance   $ 700.0            
Forward February 23                
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   $ 0 $ 28.25          
Series B Preferred Stock                
Preferred Stock, Dividends Per Share, Declared   $ 406.25 $ 812.50          
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