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Assets Held for Sale - Additional Information (Detail) - USD ($) $ in Millions	Jan. 24, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets Held For Sale [line items]
Carrying value		$ 4,259.2	$ 4,892.9
APP [Member]
Assets Held For Sale [line items]
Carrying value				$ 1.0
Purchase offer, refiner royalty offered percentage	2.00%
Purchase offer, cash	$ 40.0
Purchase offer, refiner royalty offered percentage	2.00%
APP [Member] | Capped metals [member]
Assets Held For Sale [line items]
Purchase offer, refiner royalty offered percentage	1.00%
Purchase offer, cash	$ 20.0
Purchase offer, refiner royalty offered percentage	1.00%
APP [Member] | Uncapped metals [member]
Assets Held For Sale [line items]
Purchase offer, refiner royalty offered percentage	1.00%
Purchase offer, refiner royalty offered percentage	1.00%

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- Definition

Line items for assets held for sale table.

+ References

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- Definition

The portion of consideration paid or received, consisting of a percentage of net smeller refiner royalty, in respect of both obtaining and losing control of subsidiaries or other businesses.

+ References

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- Definition

The portion of consideration paid or received, consisting of cash and cash equivalents, in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]; Cash and cash equivalents; Consideration paid (received)]

+ References

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- Definition

The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period.

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