Business combinations - Schedule of Purchase Price Allocation (Detail) - Beck Aluminum International, LLC (“Beck Trading”) $ in Millions	Nov. 01, 2016 USD ($)
Business Acquisition [Line Items]
Consideration paid at closing	$ 23.6
Purchase price allocation:
Inventories	10.6
Property, plant and equipment	6.8
Equity method investment	6.1
Prepaid expenses, supplies and other current assets	0.1
Estimated fair value of assets acquired	$ 23.6

The fair value of equity method investments included in the purchase price allocation.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of assets acquired at the acquisition date.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of inventory recognized as of the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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