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Inventories - Additional Information (Details) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Inventories [Abstract]
Inventory write-down			$ 4.1	$ 13.5	$ 3.3
Inventory write down, percentage related to specified aged inventory (percent)			66.67%	50.00%
Reversal of inventory write-down	$ 5.8	$ 4.6
Number of segments with inventory write-downs | Segment	2
Deposits from customers	$ 121.9	$ 57.9	$ 121.9	$ 57.9

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Inventories [Abstract]

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Inventory Write Down, Percentage Related To Specified Aged Inventory

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Number of Segments With Inventory Write-Downs

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The amount of deposit liabilities from customers held by the entity.

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- Definition

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

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The amount recognised as a reduction in the amount of inventories recognised as an expense due to the reversal of any write-down of inventories resulting from an increase in net realisable value. [Refer: Inventories; Inventory write-down]

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