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SIGNIFICANT ACCOUNTING POLICIES - INVESTMENT IN SSAT (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Investments in affiliates |  |  |  |  |
Investment in SSAT | $ 37.2 |  | $ 37.2 |  | $ 48.7
Financial information for equity method investment |  |  |  |  |
Company Share of Net Income | 13.0 | $ 7.7 | 35.0 | $ 15.4 |
Ocean Transportation |  |  |  |  |
Financial information for equity method investment |  |  |  |  |
Company Share of Net Income | 13.0 | 7.7 |  |  |
SSAT |  |  |  |  |
Investments in affiliates |  |  |  |  |
Investment in SSAT | 37.2 |  | 37.2 |  | $ 48.7
Financial information for equity method investment |  |  |  |  |
Operating revenue | 316.3 | 273.9 | 944.6 | 796.1 |
Operating costs and expenses | (274.2) | (243.1) | (831.3) | (738.4) |
Operating Income | 42.1 | 30.8 | 113.3 | 57.7 |
Net Income | 37.3 | 26.2 | 100.5 | 51.5 |
Company Share of Net Income | $ 13.0 | $ 7.7 | $ 35.0 | $ 15.4 |

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