Summary of Changes in Contract Assets and Contract Liabilities (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Contract assets
Increases/(decreases) due to cumulative catch up adjustment	$ 22.0
Increases/(decreases) due to revenue recognized	25.7
Increases/(decreases) due to transfer to receivables	(22.0)
Translation difference	0.0
Ending balance	25.7	[1]
Contract liabilities
Beginning balance	33.0	[2]
Increases/(decreases) due to revenue recognized	(0.4)
Translation difference	1.0
Ending balance	$ 33.6	[2]

[1] Included in other current assets.

[2] Included in other current and other non-current liabilities.