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INVESTMENT IN TRANSMISSION AFFILIATES - SUMMARIZED FINANCIAL DATA (Details) - ATC - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income statement data |  |  |  |  |
Operating revenues | $ 165.5 | $ 176.6 | $ 330.9 | $ 351.3 |
Operating expenses | 91.5 | 83.0 | 176.4 | 165.7 |
Other expense, net | 25.4 | 25.4 | 53.0 | 51.5 |
Net income | 48.6 | $ 68.2 | 101.5 | $ 134.1 |
Balance sheet data |  |  |  |  |
Current assets | 97.1 |  | 97.1 |  | $ 87.7
Noncurrent assets | 4,764.3 |  | 4,764.3 |  | 4,598.9
Total assets | 4,861.4 |  | 4,861.4 |  | 4,686.6
Current liabilities | 700.3 |  | 700.3 |  | 767.2
Long-term debt | 1,914.3 |  | 1,914.3 |  | 1,790.6
Other noncurrent liabilities | 288.0 |  | 288.0 |  | 240.3
Shareholders' equity | 1,958.8 |  | 1,958.8 |  | 1,888.5
Total liabilities and shareholders' equity | $ 4,861.4 |  | $ 4,861.4 |  | $ 4,686.6

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