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Inventories - Schedule of Inventories (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of inventories [abstract] |  |  |
Consumable stores | $ 280.0 | $ 346.7 | $ 346.3

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