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INVESTMENT IN TRANSMISSION AFFILIATES - SUMMARIZED FINANCIAL DATA (Details) - ATC - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income statement data |  |  |  |  |
Operating revenues | $ 182.2 | $ 165.5 | $ 359.9 | $ 330.9 |
Operating expenses | 93.6 | 91.5 | 184.0 | 176.4 |
Other expense, net | 28.6 | 25.4 | 57.4 | 53.0 |
Net income | 60.0 | $ 48.6 | 118.5 | $ 101.5 |
Balance sheet data |  |  |  |  |
Current assets | 88.8 |  | 88.8 |  | $ 87.2
Noncurrent assets | 5,100.7 |  | 5,100.7 |  | 4,928.8
Total assets | 5,189.5 |  | 5,189.5 |  | 5,016.0
Current liabilities | 562.1 |  | 562.1 |  | 640.0
Long-term debt | 2,213.0 |  | 2,213.0 |  | 2,014.0
Other noncurrent liabilities | 294.4 |  | 294.4 |  | 295.3
Shareholders' equity | 2,120.0 |  | 2,120.0 |  | 2,066.7
Total liabilities and shareholders' equity | $ 5,189.5 |  | $ 5,189.5 |  | $ 5,016.0

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