DERIVATIVE INSTRUMENTS - Estimated Losses in Future Periods (Details) - Designated as Hedging Instrument [Member] $ in Millions |
6 Months Ended |
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Jun. 30, 2020
USD ($)
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| Natural Gas [Member] | Ìý |
| Derivative Instruments, Gain (Loss) [Line Items] | Ìý |
| Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | $ (4.6) |
| Zinc [Member] | Ìý |
| Derivative Instruments, Gain (Loss) [Line Items] | Ìý |
| Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | 0.6 |
| Electricity [Member] | Ìý |
| Derivative Instruments, Gain (Loss) [Line Items] | Ìý |
| Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | $ (1.0) |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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