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Contingencies (Details) - Tax contingent liability [Member] MXN in Millions, $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN | Nov. 30, 2010 USD ($) | Nov. 30, 2010 MXN
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Disclosure of contingent liabilities [line items] |  |  |  |
Amount of tax deduction disallowed by Mexican tax authorities | $ |  |  | $ 10.0 |
Amount of tax deduction disallowed by Mexican tax authorities that would be applied against available tax losses | $ |  |  | 4.3 |
Amount of tax deduction disallowed by Mexican tax authorities, subsequently reversed | $ |  |  | $ 4.8 |
Portion of disputed tax deduction remaining relating to transactions with certain suppliers | $ | $ 5.2 |  |  |
Portion of disputed tax deduction remaining relating to value added taxes | $ | 0.9 |  |  |
Value of bond that may be required to secure value added tax portion | $ | $ 0.9 |  |  |
Mexican Peso [Member] |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Amount of tax deduction disallowed by Mexican tax authorities | MXN |  |  |  | MXN 196.8
Amount of tax deduction disallowed by Mexican tax authorities that would be applied against available tax losses | MXN |  |  |  | 84.4
Amount of tax deduction disallowed by Mexican tax authorities, subsequently reversed | MXN |  |  |  | MXN 94.6
Portion of disputed tax deduction remaining relating to transactions with certain suppliers | MXN |  | MXN 102.2 |  |
Portion of disputed tax deduction remaining relating to value added taxes | MXN |  | 17.8 |  |
Value of bond that may be required to secure value added tax portion | MXN |  | MXN 17.8 |  |

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- Definition Amount of tax deduction disallowed by Mexican tax authorities, subsequently reversed. + References No definition available. + Details
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- Definition Amount of tax deduction disallowed by Mexican tax authorities that would be applied against available tax losses. + References No definition available. + Details
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- Details
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