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v3.10.0.1

Segmented and geographic information, and major customers (Geographic Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Mexican Operations [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Derivative pricing adjustments | $ 29.0 | $ 5.0 | $ 30.0 | $ 13.0
U.S. Operations [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Derivative pricing adjustments | $ 4.0 | $ 2.0 | $ 5.0 | $ 10.0

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Derivative pricing adjustments. + References No definition available. + Details
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Namespace Prefix: | usas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |