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Inventories - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Inventories [Abstract]
Inventory write-down	$ 0.9	$ 3.3	$ 12.0	$ 3.8

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- Definition

Inventories [Abstract]

+ References

No definition available.

+ Details

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- Definition

The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories]

+ References

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