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INVESTMENT IN AMERICAN TRANSMISSION COMPANY - SUMMARIZED FINANCIAL DATA (Details) - ATC - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Income statement data |  |  |  |  |
Revenues | $ 171.1 | $ 158.1 | $ 522.4 | $ 476.6 |
Operating expenses | 85.0 | 80.2 | 250.1 | 241.0 |
Other expense | 27.5 | 23.5 | 79.6 | 71.2 |
Net income | 58.6 | $ 54.4 | 192.7 | $ 164.4 |
Balance sheet data |  |  |  |  |
Current assets | 89.0 |  | 89.0 |  | $ 75.8
Noncurrent assets | 4,564.9 |  | 4,564.9 |  | 4,312.9
Total assets | 4,653.9 |  | 4,653.9 |  | 4,388.7
Current liabilities | 772.1 |  | 772.1 |  | 495.1
Long-term debt | 1,740.8 |  | 1,740.8 |  | 1,865.3
Other noncurrent liabilities | 213.8 |  | 213.8 |  | 271.5
Shareholders' equity | 1,927.2 |  | 1,927.2 |  | 1,756.8
Total liabilities and shareholders' equity | $ 4,653.9 |  | $ 4,653.9 |  | $ 4,388.7

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