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GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Intangible Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 220.2 |
Finite-Lived Intangible Assets, Accumulated Amortization | (27.6) |
Finite-Lived Intangible Assets, Net | 192.6 |
Finite-Lived Intangible Liabilities, Gross | (75.0) |
Finite-Lived Intangible Liabilities, Accumulated Amortization | 2.7 |
Finite-Lived Intangible Liabilities, Net | (72.3) |
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 77.0 |
Finite-Lived Intangible Assets, Accumulated Amortization | (1.5) |
Finite-Lived Intangible Assets, Net | 75.5 |
Technology-Based Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 60.0 |
Finite-Lived Intangible Assets, Accumulated Amortization | (1.2) |
Finite-Lived Intangible Assets, Net | 58.8 |
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 11.0 |
Finite-Lived Intangible Assets, Accumulated Amortization | (0.4) |
Finite-Lived Intangible Assets, Net | 10.6 |
Mining Permits [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 72.2 | $ 72.2
Finite-Lived Intangible Assets, Accumulated Amortization | (24.5) | (24.1)
Finite-Lived Intangible Assets, Net | $ 47.7 | $ 48.1

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