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INVESTMENT IN TRANSMISSION AFFILIATES - SUMMARIZED FINANCIAL DATA (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Summarized financial data      
Operating revenues $ 2,888.1 $ 2,908.1  
Operating expenses 2,218.8 2,176.7  
Other expense, net 87.6 36.3  
Current assets 2,838.5   $ 3,187.7
Noncurrent assets 39,957.4   38,684.4
Total assets 42,795.9   41,872.1
Current liabilities 3,765.8   4,611.0
Other noncurrent liabilities 1,794.9   1,475.3
Total liabilities and members' equity 42,795.9   41,872.1
ATC      
Summarized financial data      
Operating revenues 200.4 191.0  
Operating expenses 99.1 95.5  
Other expense, net 32.5 28.0  
Net income 68.8 $ 67.5  
Current assets 100.2   89.6
Noncurrent assets 6,070.8   5,997.8
Total assets 6,171.0   6,087.4
Current liabilities 459.7   511.9
Long-term debt 2,712.5   2,613.0
Other noncurrent liabilities 502.5   485.8
Members' equity 2,496.3   2,476.7
Total liabilities and members' equity $ 6,171.0   $ 6,087.4