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INVESTMENT IN AMERICAN TRANSMISSION COMPANY - SUMMARIZED FINANCIAL DATA (Details) - ATC - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Income statement data |  |  |
Revenues | $ 174.7 | $ 164.2 |
Operating expenses | 82.4 | 79.1 |
Other expense | 26.4 | 24.0 |
Net income | 65.9 | $ 61.1 |
Balance sheet data |  |  |
Current assets | 85.5 |  | $ 75.8
Noncurrent assets | 4,402.2 |  | 4,312.9
Total assets | 4,487.7 |  | 4,388.7
Current liabilities | 401.8 |  | 495.1
Long-term debt | 1,940.4 |  | 1,865.3
Other noncurrent liabilities | 282.9 |  | 271.5
Shareholders' equity | 1,862.6 |  | 1,756.8
Total liabilities and shareholders' equity | $ 4,487.7 |  | $ 4,388.7

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