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Foreign currency - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Intercompany Foreign Currency Balance [Line Items] |  |  |
Gain (loss) recognized on foreign exchange | $ (5.9) | $ (9.9) | $ 2.3
Exiting Foreign Countries |  |  |
Intercompany Foreign Currency Balance [Line Items] |  |  |
Gain (loss) recognized on foreign exchange |  | $ (11.8) |
Argentina |  |  |
Intercompany Foreign Currency Balance [Line Items] |  |  |
Net monetary assets denominated in local currency | $ 5.1 |  |

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