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Introduction - Foreign exchange rates (Details) | 12 Months Ended
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Dec. 31, 2018 L / $ ₡ / $ C$ / $ Tsh / $ $ / $ € / $ Q / $ GH₵ / $ ₲ / $ Bs. / $ / $ kr / $ £ / $ | Dec. 31, 2017 L / $ ₡ / $ C$ / $ Tsh / $ $ / $ € / $ Q / $ GH₵ / $ ₲ / $ Bs. / $ / $ kr / $ £ / $ | Dec. 31, 2016 L / $ ₡ / $ C$ / $ Tsh / $ $ / $ € / $ Q / $ GH₵ / $ ₲ / $ Bs. / $ / $ kr / $ £ / $
Bolivia |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | Bs. / $ | 6.91 | 6.91 | 6.91
Closing foreign exchange rate | Bs. / $ | 6.91 | 6.91 |
Chad |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | / $ | 571 | 588 | 600
Closing foreign exchange rate | / $ | 580 | 558 |
Change in closing foreign exchange rate | 0.0399 | 0.1200 |
Colombia |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | $ / $ | 2,973 | 2,961 | 3,049
Closing foreign exchange rate | $ / $ | 3,250 | 2,984 |
Change in closing foreign exchange rate | 0.0891 | 0.0100 |
Costa Rica, Colones |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | ₡ / $ | 578 | 571 | 551
Closing foreign exchange rate | ₡ / $ | 608 | 573 |
Change in closing foreign exchange rate | 0.0612 | (0.0200) |
Ghanaian cedi |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | GH₵ / $ | 4.63 | 4.36 | 3.92
Closing foreign exchange rate | GH₵ / $ | 4.82 | 4.42 |
Change in closing foreign exchange rate | 0.0912 | (0.0500) |
Guatemala, Quetzales |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | Q / $ | 7.52 | 7.36 | 7.61
Closing foreign exchange rate | Q / $ | 7.74 | 7.34 |
Change in closing foreign exchange rate | 0.0541 | 0.0200 |
Honduras, Lempiras |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | L / $ | 23.99 | 23.58 | 22.92
Closing foreign exchange rate | L / $ | 24.42 | 23.67 |
Change in closing foreign exchange rate | 0.0319 | 0.0000 |
Euro Member Countries, Euro |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | € / $ | 0.85 | 0.89 | 0.91
Closing foreign exchange rate | € / $ | 0.87 | 0.83 |
Change in closing foreign exchange rate | 0.0508 | 0.1200 |
Nicaragua, Cordobas |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | C$ / $ | 31.55 | 30.05 | 28.62
Closing foreign exchange rate | C$ / $ | 32.33 | 30.79 |
Change in closing foreign exchange rate | 0.05 | (0.0500) |
Paraguay |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | ₲ / $ | 5,743 | 5,626 | 5,686
Closing foreign exchange rate | ₲ / $ | 5,961 | 5,590 |
Change in closing foreign exchange rate | 0.0664 | 0.0300 |
Luxembourg (SEK denominated) |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | kr / $ | 8.71 | 8.53 | 8.58
Closing foreign exchange rate | kr / $ | 8.85 | 8.18 |
Change in closing foreign exchange rate | 0.0823 | 0.1000 |
Tanzania |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | Tsh / $ | 2,274 | 2,233 | 2,183
Closing foreign exchange rate | Tsh / $ | 2,299 | 2,245 |
Change in closing foreign exchange rate | 0.0242 | (0.0300) |
United Kingdom, Pounds |  |  |
Foreign Exchange Rate [Line Items] |  |  |
Average foreign exchange rate | £ / $ | 0.75 | 0.77 | 0.74
Closing foreign exchange rate | £ / $ | 0.78 | 0.74 |
Change in closing foreign exchange rate | 0.0593 | 0.0900 |

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