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Equity (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 01, 2024
Sep. 30, 2024
Sep. 27, 2024
Sep. 17, 2024
Sep. 11, 2024
May 22, 2024
Feb. 22, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 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       20,000,000    
Preferred Stock, Shares Outstanding   0           0   0       40,000    
Preferred Stock, Par or Stated Value Per Share   $ 0.01           $ 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 $ 34.06 $ 34.32 $ 34.01 $ 25.77 $ 28.79 $ 28.87   $ 33.72       $ 25.78        
Preferred Stock, Liquidation Preference Per Share                               $ 1,000
Preferred Stock Redemption Premium               $ 0 $ 0 $ 14,000,000.0 $ 6,200,000          
Pension Plan                                
Defined Benefit Plan, Plan Assets, Contributions by Employer                   1,900,000 2,600,000          
Other Postretirement Benefit Plan                                
Defined Benefit Plan, Plan Assets, Contributions by Employer                   18,300,000 $ 16,700,000          
At The Market Program                                
Common Stock Aggregate Sale Price             $ 900,000,000.0                  
ATM Program Equity Remaining Available for Issuance                   $ 297.7            
Forward February 23                                
Common Stock Aggregate Sale Price               199,900,000                
Forward Contract Indexed to Issuer's Equity, Shares                       7,757,951        
Forward September 24                                
Common Stock Aggregate Sale Price               $ 50,400,000                
Forward Contract Indexed to Issuer's Equity, Shares     1,495,949                          
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 $ 1,625          
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     20,000      
Series C Preferred Stock                                
Preferred Stock, Shares Outstanding                             862,500