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SIGNIFICANT ACCOUNTING POLICIES - INVESTMENT IN TERMINAL JOINT VENTURE (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Investments in affiliates |  |  |
Investment in Terminal Joint Venture | $ 91.3 |  | $ 87.0
Financial information for equity method investment |  |  |
Company Share of Net Income | 8.5 | $ 10.5 |
SSAT |  |  |
Financial information for equity method investment |  |  |
Operating revenue | 268.1 | 250.9 |
Operating costs and expenses | (244.2) | (219.7) |
Operating Income | 23.9 | 31.2 |
Net Income | $ 22.5 | $ 30.7 |

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