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INVESTMENT IN TRANSMISSION AFFILIATES - SUMMARIZED FINANCIAL DATA (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Summarized financial data          
Operating revenues $ 1,957.4 $ 2,003.0 $ 6,675.5 $ 7,039.0  
Operating expenses 1,485.4 1,598.8 5,108.9 5,495.2  
Other expense, net 96.0 29.1 270.4 122.4  
Current assets 2,443.6   2,443.6   $ 3,187.7
Noncurrent assets 40,998.1   40,998.1   38,684.4
Total assets 43,441.7   43,441.7   41,872.1
Current liabilities 4,073.7   4,073.7   4,611.0
Other noncurrent liabilities 828.3   828.3   832.2
Total liabilities and members' equity 43,441.7   43,441.7   41,872.1
ATC          
Summarized financial data          
Operating revenues 206.2 169.8 610.4 552.4  
Operating expenses 102.8 97.7 303.4 288.4  
Other expense, net 32.9 34.5 98.3 91.3  
Net income 70.5 $ 37.6 208.7 $ 172.7  
Current assets 98.7   98.7   89.6
Noncurrent assets 6,234.6   6,234.6   5,997.8
Total assets 6,333.3   6,333.3   6,087.4
Current liabilities 333.0   333.0   511.9
Long-term debt 2,810.7   2,810.7   2,613.0
Other noncurrent liabilities 589.1   589.1   485.8
Members' equity 2,600.5   2,600.5   2,476.7
Total liabilities and members' equity $ 6,333.3   $ 6,333.3   $ 6,087.4