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INVESTMENT IN TRANSMISSION AFFILIATES - SUMMARIZED FINANCIAL DATA (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Summarized financial data          
Operating revenues $ 1,830.0 $ 2,127.9 $ 4,718.1 $ 5,036.0  
Operating expenses 1,404.7 1,719.7 3,623.5 3,896.4  
Other expense, net 86.8 57.0 174.4 93.3  
Current assets 2,457.6   2,457.6   $ 3,187.7
Noncurrent assets 40,561.7   40,561.7   38,684.4
Total assets 43,019.3   43,019.3   41,872.1
Current liabilities 4,096.9   4,096.9   4,611.0
Other noncurrent liabilities 832.0   832.0   832.2
Total liabilities and members' equity 43,019.3   43,019.3   41,872.1
ATC          
Summarized financial data          
Operating revenues 203.8 191.6 404.2 382.6  
Operating expenses 101.5 95.2 200.6 190.7  
Other expense, net 32.9 28.8 65.4 56.8  
Net income 69.4 $ 67.6 138.2 $ 135.1  
Current assets 100.7   100.7   89.6
Noncurrent assets 6,149.0   6,149.0   5,997.8
Total assets 6,249.7   6,249.7   6,087.4
Current liabilities 438.8   438.8   511.9
Long-term debt 2,712.8   2,712.8   2,613.0
Other noncurrent liabilities 542.7   542.7   485.8
Members' equity 2,555.4   2,555.4   2,476.7
Total liabilities and members' equity $ 6,249.7   $ 6,249.7   $ 6,087.4