Inventories - Schedule of Inventories (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of inventories [line items]
Cost of sales of consumable stores	$ 346.7	$ 346.3	$ 380.7
Non-Current Assets Held for Sale [member]
Disclosure of inventories [line items]
Consumable stores fair value reclassified to assets held for sale		$ 7.8

The disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.

No definition available.

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