v3.26.1
Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 22, 2024
Jun. 30, 2026
Feb. 28, 2026
Oct. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share   $ 46.47 $ 45.63 $ 41.84        
Customer revenues         $ 1,289.5 $ 1,246.5 $ 3,611.8 $ 3,396.0
Preferred Stock, Redemption Amount             3.6  
Corporate and Other                
Customer revenues         $ 0.0 $ 0.0 $ 0.0 0.0
Forward Oct 25                
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share             $ 41.72  
Forward February 26                
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share             45.46  
Forward June 26                
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share             $ 46.10  
Pension Plan                
Defined Benefit Plan, Plan Assets, Contributions by Employer             $ 2.6 1.0
Other Postretirement Benefit Plan                
Defined Benefit Plan, Plan Assets, Contributions by Employer             11.1 $ 10.5
At The Market Program                
Common Stock Aggregate Sale Price $ 1,500.0              
ATM Program Equity Remaining Available for Issuance             1,150.0  
Forward Oct 25                
Common Stock Aggregate Sale Price             99.7  
Forward Contract Indexed to Issuer's Equity, Shares       2,390,057        
Forward February 26                
Common Stock Aggregate Sale Price             100.0  
Forward Contract Indexed to Issuer's Equity, Shares     2,200,000          
Retained Deficit                
Preferred Stock, Redemption Amount             (3.6)  
Forward June 26                
Common Stock Aggregate Sale Price             $ 99.2  
Forward Contract Indexed to Issuer's Equity, Shares     2,151,874