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INVESTMENT IN TRANSMISSION AFFILIATES - SUMMARIZED FINANCIAL DATA (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Summarized financial data          
Operating revenues $ 2,127.9 $ 1,676.2 $ 5,036.0 $ 4,367.6  
Operating expenses 1,719.7 1,307.4 3,896.4 3,369.5  
Other expense, net 57.0 39.0 93.3 83.1  
Current assets 2,642.5   2,642.5   $ 2,656.7
Noncurrent assets 36,964.6   36,964.6   36,331.8
Total assets 39,607.1   39,607.1   38,988.5
Current liabilities 3,817.8   3,817.8   3,753.0
Other noncurrent liabilities 1,176.9   1,176.9   1,203.2
Total liabilities and members' equity 39,607.1   39,607.1   38,988.5
ATC          
Summarized financial data          
Operating revenues 191.6 185.9 382.6 374.6  
Operating expenses 95.2 92.4 190.7 187.5  
Other expense, net 28.8 28.1 56.8 56.6  
Net income 67.6 $ 65.4 135.1 $ 130.5  
Current assets 106.0   106.0   89.8
Noncurrent assets 5,801.8   5,801.8   5,628.1
Total assets 5,907.8   5,907.8   5,717.9
Current liabilities 482.7   482.7   436.9
Long-term debt 2,562.4   2,562.4   2,513.0
Other noncurrent liabilities 438.5   438.5   422.0
Members' equity 2,424.2   2,424.2   2,346.0
Total liabilities and members' equity $ 5,907.8   $ 5,907.8   $ 5,717.9