Amount of long-term purchase commitments.

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Agreements expiry period.

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Percentage of revenue generated from entity's top ten customers.

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Number of customers to whom we sell TiO2.

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Percentage of annual production capacity represented by Leverkusen facility.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Commitment and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) Customer	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Commitment And Contingencies [Line Items]
TiO2 Customers \| Customer	4,000
Net Sales of TiO2	34.00%	33.00%	34.00%
Current Tio2 production capacity in Leverkusen facility	33.00%
Net rent expense	$ 16.0	$ 14.0	$ 14.0
Aggregate future minimum rental commitments	53.0
Leverkusen Facility Lease
Commitment And Contingencies [Line Items]
Aggregate future minimum rental commitments	$ 17.0
Minimum
Commitment And Contingencies [Line Items]
Long term master agreements expiring	2018
Maximum
Commitment And Contingencies [Line Items]
Long term master agreements expiring	2021
Feedstock
Commitment And Contingencies [Line Items]
Minimum purchase commitments	$ 383.0
Various Raw Materials and Services
Commitment And Contingencies [Line Items]
Minimum purchase commitments	$ 128.0
Net Sales \| Product Concentration Risk \| Titanium Dioxide Pigments
Commitment And Contingencies [Line Items]
Approximate percent sales by volume	94.00%	93.00%	92.00%
Net Sales \| Customer Concentration Risk \| Behr Process Corporation
Commitment And Contingencies [Line Items]
Approximate percent sales by volume		10.00%	10.00%