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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Abstract] |  |  |
Depreciation expense | $ 20.2 | $ 19.7 | $ 16.7
Capital lease assets | 2.9 |  |
Capital lease assets |  | 3.1 |
Accumulated deprecation of capital lease assets | $ 1.7 |  |
Accumulated deprecation of capital lease assets |  | $ 1.6 |

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