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INVESTMENT IN SSAT (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 01, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Investments in affiliates |  |  |  |  |  |
Investment in SSAT |  | $ 93.3 |  | $ 93.3 |  | $ 85.5
Financial information for equity method investment |  |  |  |  |  |
Company Share of SSAT's Net Income (Loss) |  | 6.9 | $ 1.3 | 8.5 | $ (1.9) |
SSAT ST |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |
Ownership percentage, noncontrolling owner | 50.00% |  |  |  |  |
SSAT |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |
Investment in SSAT |  | 93.3 |  | 93.3 |  | $ 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 |  | 320.8 | 268.4 | 865.0 | 742.1 |
Operating costs and expenses |  | (301.3) | (269.4) | (858.2) | (754.2) |
Operating loss |  | 19.5 | (1.0) | 6.8 | (12.1) |
Net Profit (Loss) |  | 21.6 | 1.5 | 19.9 | (7.4) |
SSAT |  |  |  |  |  |
Financial information for equity method investment |  |  |  |  |  |
Company Share of SSAT's Net Income (Loss) |  | $ 6.9 | $ 1.3 | $ 8.5 | $ (1.9) |
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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