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INVESTMENT IN TRANSMISSION AFFILIATES - SUMMARIZED FINANCIAL DATA (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Summarized financial data      
Operating revenues $ 3,149.5 $ 2,680.2  
Operating expenses 2,212.0 1,866.8  
Other expense, net 151.3 103.1  
Current assets 2,943.3   $ 2,911.7
Noncurrent assets 45,288.8   44,451.5
Total assets 48,232.1 43,927.2 47,363.2
Current liabilities 5,862.9   4,841.9
Long-term debt 16,161.8   17,178.1
Other noncurrent liabilities 868.0   838.1
Total liabilities and members' equity 48,232.1   47,363.2
ATC      
Summarized financial data      
Operating revenues 234.9 211.9  
Operating expenses 116.7 104.8  
Other expense, net 39.1 35.2  
Net income 79.1 $ 71.9  
Current assets 145.8   126.6
Noncurrent assets 6,946.6   6,792.6
Total assets 7,092.4   6,919.2
Current liabilities 639.1   482.4
Long-term debt 3,025.9   3,083.4
Other noncurrent liabilities 559.0   545.0
Members' equity 2,868.4   2,808.4
Total liabilities and members' equity $ 7,092.4   $ 6,919.2