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LEASES - FUTURE MINIMUM LEASE PAYMENTS (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Total operating leases |  |  |
Six months ended December 31, 2019 | $ 2.7 |  |
2020 | 6.9 |  |
2021 | 4.9 |  |
2022 | 4.9 |  |
2023 | 5.0 |  |
2024 | 4.8 |  |
Thereafter | 30.5 |  |
Total minimum lease payments | 59.7 |  |
Less: interest | (15.3) |  |
Present value of minimum lease payments | 44.4 | $ 48.8 |
Less: short-term lease liabilities | (4.3) |  |
Long-term lease liabilities | 40.1 |  |
Power purchase commitment |  |  |
Six months ended December 31, 2019 | 4.1 |  |
2020 | 8.8 |  |
2021 | 9.4 |  |
2022 | 4.2 |  |
2023 | 0.0 |  |
2024 | 0.0 |  |
Thereafter | 0.0 |  |
Total minimum lease payments | 26.5 |  |
Less: interest | (5.5) |  |
Present value of minimum lease payments | 21.0 |  |
Less: short-term lease liabilities | (5.6) |  |
Long-term lease liabilities | $ 15.4 |  |
Capital lease |  |  |
Short-term liabilities under capital lease |  |  | $ 4.9
Long-term liabilities under capital lease |  |  | $ 18.4

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