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Investment in Transmission Affiliates - ATC Summarized Financial Data (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment in transmission affiliates                      
Operating revenues $ 1,933.4 $ 1,651.0 $ 1,548.7 $ 2,108.6 $ 1,947.5 $ 1,608.0 $ 1,590.2 $ 2,377.4 $ 7,241.7 $ 7,523.1 $ 7,679.5
Operating expenses                 5,535.6 5,991.7 6,211.1
Other expense, net                 276.8 271.7 238.1
Current assets 2,083.0       2,093.6       2,083.0 2,093.6  
Noncurrent assets 34,945.1       32,858.2       34,945.1 32,858.2  
Total assets 37,028.1       34,951.8       37,028.1 34,951.8 33,475.8
Current liabilities 4,148.1       3,182.7       4,148.1 3,182.7  
Long-term debt 11,672.8       11,171.4       11,672.8 11,171.4  
Other noncurrent liabilities 1,229.4       1,128.9       1,229.4 1,128.9  
Total liabilities and members' equity 37,028.1       34,951.8       37,028.1 34,951.8  
ATC                      
Investment in transmission affiliates                      
Operating revenues                 758.1 744.4 690.5
Operating expenses                 372.5 373.5 358.7
Other expense, net                 110.8 110.5 108.3
Net income                 274.8 260.4 $ 223.5
Current assets 92.7       84.7       92.7 84.7  
Noncurrent assets 5,400.6       5,244.2       5,400.6 5,244.2  
Total assets 5,493.3       5,328.9       5,493.3 5,328.9  
Current liabilities 310.8       502.6       310.8 502.6  
Long-term debt 2,512.2       2,312.8       2,512.2 2,312.8  
Other noncurrent liabilities 378.2       298.9       378.2 298.9  
Members' equity 2,292.1       2,214.6       2,292.1 2,214.6  
Total liabilities and members' equity $ 5,493.3       $ 5,328.9       $ 5,493.3 $ 5,328.9