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Quarterly Results of Operations - Schedule of Quarterly Results of Operations (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gain on land sales	$ 4.4					$ 12.5	$ 4.4	$ 12.5
Litigation settlement expense, net		$ 19.3			$ 62.0		19.3	62.0
Current cash tax income tax expense related to GILTI			$ 4.0
Infrastructure reimbursement		8.8					9.2	4.3	$ 1.0
Insurance recoveries		$ 7.7					7.7	1.3	$ 0.4
Gain on sale of insurance and risk management business	$ 3.0						$ 3.0	$ 58.4
Kronos Worldwide, Inc.
Non-cash deferred income tax benefit				$ 112.0
Amalgamated Sugar Company LLC
Gain on securities transaction recognized				$ 12.5

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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Amount of income tax benefit for remeasurement of deferred tax liability from change in tax rate pursuant to Tax Cuts and Jobs Act.

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Current cash income tax expense related to global intangible low tax income.

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Gain (loss) on securities transaction recognized.

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Infrastructure development cost reimbursed.

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