Other Income, Net - Schedule of Components of Other Income (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest income and other:
Interest and dividends			$ 2.8	$ 1.9
Securities transactions, net			(0.5)	0.1
Total			2.3	2.0
Infrastructure reimbursement	$ 0.8		0.8	6.2
Gain on land and related sales				5.6
Currency transactions, net			10.4
Other, net			1.5	1.0
Total	$ 15.0	$ 7.8	$ 15.0	$ 14.8

Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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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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Infrastructure development cost reimbursed.

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Aggregate nonoperating income amounts earned from investment securities including dividends, interest on securities, profits (losses) on securities and net and miscellaneous other income items.

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