Other Income, Net - Schedule of Components of Other Income (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Securities earnings:
Dividends and interest			$ 1.9	$ 2.9
Securities transactions, net			0.1	(0.3)
Total	$ 1.1	$ 1.0	2.0	2.6
Currency transactions, net				6.1
Insurance recoveries				1.6
Infrastructure reimbursement			6.2	19.1
Gain on land and related sales			5.6	0.5
Other, net			1.0	1.4
Total	$ 7.8	$ (3.6)	$ 14.8	$ 31.3

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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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

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Amount of revenue and income classified as other.

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Amount of income (expense) related to nonoperating activities, classified as other.

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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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