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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of increase in the fair value of derivatives recognized in the income statement.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The net cash outflow or inflow from derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

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Note 10 - Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 10 - Derivative Instruments (Details) [Line Items]
Derivative, Gain on Derivative	$ 1.5us-gaap_DerivativeGainOnDerivative	$ 3.0us-gaap_DerivativeGainOnDerivative
Unsettled Sales and Forecasted Future Concentrate Contracts [Member] \| Other Current Assets [Member]
Note 10 - Derivative Instruments (Details) [Line Items]
Derivative Asset, Current	5.3
Derivative Liability, Current	1.9
Unsettled Sales and Forecasted Future Concentrate Contracts [Member] \| Other Noncurrent Assets [Member]
Note 10 - Derivative Instruments (Details) [Line Items]
Derivative Asset, Noncurrent	6.0
Derivative Liability, Noncurrent	1.8
Unsettled Concentrate Sales Contracts [Member]
Note 10 - Derivative Instruments (Details) [Line Items]
Derivative, Gain on Derivative	1.5
Forecasted Future Concentrate Contracts [Member] \| Losses Realized On Settled Contracts [Member]
Note 10 - Derivative Instruments (Details) [Line Items]
Derivative, Gain on Derivative	3.6
Forecasted Future Concentrate Contracts [Member]
Note 10 - Derivative Instruments (Details) [Line Items]
Derivative, Gain on Derivative	9.1
Lucky Friday [Member]
Note 10 - Derivative Instruments (Details) [Line Items]
Payments for (Proceeds from) Derivative Instrument, Financing Activities			$ 3.1