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INVESTMENT IN SSAT (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 01, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Investments in affiliates |  |  |  |  |  |
Investment in SSAT |  | $ 86.4 |  | $ 86.4 |  | $ 85.5
Financial information for equity method investment |  |  |  |  |  |
Company Share of SSAT's Net Income (Loss) (2) |  | 1.2 | $ (1.4) | 1.6 | $ (3.2) |
SSAT ST |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |
Ownership percentage, noncontrolling owner | 50.00% |  |  |  |  |
SSAT |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |
Investment in SSAT |  | 86.4 |  | 86.4 |  | $ 85.5
Increase in equity method investment in SSAT | $ 13.2 |  |  |  |  |
Equity Method Investments, Increase (decrease) in deferred income taxes expense (benefit), | 3.1 |  |  |  |  |
Equity method investments, increase (decrease) in retained earnings | $ 10.1 |  |  |  |  |
Financial information for equity method investment |  |  |  |  |  |
Operating revenue |  | 273.9 | 242.9 | 544.2 | 473.7 |
Operating costs and expenses |  | (278.5) | (248.9) | (556.9) | (484.8) |
Operating loss |  | (4.6) | (6.0) | (12.7) | (11.1) |
Net Profit (Loss) (1) |  | 2.1 | (4.1) | (1.7) | (8.9) |
SSAT |  |  |  |  |  |
Financial information for equity method investment |  |  |  |  |  |
Company Share of SSAT's Net Income (Loss) (2) |  | $ 1.2 | $ (1.4) | $ 1.6 | $ (3.2) |
SSAT | SSAT ST |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |
Percentage of interests sold in SSAT ST | 25.00% |  |  |  |  |
SSAT's ownership interest in SSAT ST (as a percent) | 50.00% |  |  |  |  |

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