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INVESTMENT IN AMERICAN TRANSMISSION COMPANY - SUMMARIZED FINANCIAL DATA (Details) - ATC - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Income statement data |  |  |  |  |
Revenues | $ 176.6 | $ 154.3 | $ 351.3 | $ 318.5 |
Operating expenses | 82.7 | 81.7 | 165.1 | 160.8 |
Other expense | 25.7 | 23.7 | 52.1 | 47.7 |
Net income | 68.2 | $ 48.9 | 134.1 | $ 110.0 |
Balance sheet data |  |  |  |  |
Current assets | 86.2 |  | 86.2 |  | $ 75.8
Noncurrent assets | 4,489.3 |  | 4,489.3 |  | 4,312.9
Total assets | 4,575.5 |  | 4,575.5 |  | 4,388.7
Current liabilities | 640.3 |  | 640.3 |  | 495.1
Long-term debt | 1,740.6 |  | 1,740.6 |  | 1,865.3
Other noncurrent liabilities | 291.4 |  | 291.4 |  | 271.5
Shareholders' equity | 1,903.2 |  | 1,903.2 |  | 1,756.8
Total liabilities and shareholders' equity | $ 4,575.5 |  | $ 4,575.5 |  | $ 4,388.7

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