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INVESTMENT IN TRANSMISSION AFFILIATES - SUMMARIZED FINANCIAL DATA (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Summarized financial data          
Operating revenues $ 2,104.0 $ 1,863.5 $ 7,263.0 $ 6,315.7  
Operating expenses 1,654.4 1,479.8 5,471.0 4,753.8  
Other expense, net 145.0 113.5 438.7 329.8  
Current assets 2,515.3   2,515.3   $ 2,911.7
Noncurrent assets 47,293.6   47,293.6   44,451.5
Total assets 49,808.9 45,196.5 49,808.9 45,196.5 47,363.2
Current liabilities 5,050.3   5,050.3   4,841.9
Long-term debt 17,663.3   17,663.3   17,178.1
Other noncurrent liabilities 991.0   991.0   838.1
Total liabilities and members' equity 49,808.9   49,808.9   47,363.2
ATC          
Summarized financial data          
Operating revenues 245.1 221.4 721.2 651.6  
Operating expenses 116.9 110.1 351.2 324.1  
Other expense, net 41.4 36.4 123.2 107.4  
Net income 86.8 $ 74.9 246.8 $ 220.1  
Current assets 141.5   141.5   126.6
Noncurrent assets 7,348.8   7,348.8   6,792.6
Total assets 7,490.3   7,490.3   6,919.2
Current liabilities 772.6   772.6   482.4
Long-term debt 3,031.6   3,031.6   3,083.4
Other noncurrent liabilities 613.1   613.1   545.0
Members' equity 3,073.0   3,073.0   2,808.4
Total liabilities and members' equity $ 7,490.3   $ 7,490.3   $ 6,919.2