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MULTI-EMPLOYER WITHDRAWAL LIABILITY (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Multiemployer withdrawal liability |  |
Quarterly payments to ILA-PRSSA over an estimated period | $ 1.0 |
Estimated future benefit payments |  |
Current portion of withdrawal liability | (10.8) | $ (4.1)
Long-term portion of withdrawal liability | 56.6 | $ 65.1
Horizon | ILA-PRSSA Pension Fund |  |
Estimated future benefit payments |  |
2019 | 4.1 |
2020 | 4.1 |
2021 | 4.1 |
2022 | 4.1 |
2023 | 4.1 |
Thereafter | 68.0 |
Total future payments | 88.5 |
Less: amount representing interest | (27.8) |
Present value of remaining withdrawal liability | 60.7 |
Current portion of withdrawal liability | (4.1) |
Long-term portion of withdrawal liability | 56.6 |
Horizon | Local 153 Fund of the OPEIU |  |
Estimated future benefit payments |  |
Present value of remaining withdrawal liability | $ 6.7 |

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