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Borrowings and Other Financing Instruments Forward Equity Agreements (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
Mar. 31, 2025
Nov. 30, 2024
Forward Contract Indexed to Issuer's Equity [Line Items]    
Shares Issued, Price Per Share   $ 64.44
Forward Equity Agreements    
Forward Contract Indexed to Issuer's Equity [Line Items]    
Common Stock, Shares to be Issued through forward Equity Agreement   21,100
Common stock, initial shares in an agreement   18,300
Common stock, additional shares in an agreement   2,800
Period End Settlement Price, in Shares 21,100  
Period End Settlement Price, in Cash $ 1,350,000  
Period End Net Cash Settlement Price 116,000  
Period End Net Share Settlement Price 1,700  
Expected Settlement Price $ 1,360,000