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INVESTMENT IN TRANSMISSION AFFILIATES - SUMMARIZED FINANCIAL DATA (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Summarized financial data          
Operating revenues $ 1,651.0 $ 1,608.0 $ 5,308.3 $ 5,575.6  
Operating expenses 1,280.8 1,297.1 3,972.7 4,407.3  
Other expense, net 56.2 65.3 183.1 186.3  
Current assets 1,727.2   1,727.2   $ 2,093.6
Noncurrent assets 33,694.8   33,694.8   32,858.2
Assets 35,422.0   35,422.0   34,951.8
Current liabilities 2,840.0   2,840.0   3,182.7
Other noncurrent liabilities 1,128.6   1,128.6   1,128.9
Total liabilities and members' equity 35,422.0   35,422.0   34,951.8
ATC          
Summarized financial data          
Operating revenues 187.8 184.9 577.7 544.8  
Operating expenses 93.0 94.7 285.7 278.7  
Other expense, net 28.1 28.7 82.0 86.1  
Net income 66.7 $ 61.5 210.0 $ 180.0  
Current assets 92.5   92.5   84.7
Noncurrent assets 5,375.2   5,375.2   5,244.2
Assets 5,467.7   5,467.7   5,328.9
Current liabilities 349.9   349.9   502.6
Long-term debt 2,512.1   2,512.1   2,312.8
Other noncurrent liabilities 335.0   335.0   298.9
Members' equity 2,270.7   2,270.7   2,214.6
Total liabilities and members' equity $ 5,467.7   $ 5,467.7   $ 5,328.9