Other Income, Net (Tables)

9 Months Ended

Sep. 30, 2018

Other Income And Expenses [Abstract]

Schedule of Components of Other Income

	Nine months ended September 30,
	2017			2018
	(In millions)
Securities earnings:
Dividends and interest	$	21.5		$	23.5
Securities transactions, net		.1			12.6
Total		21.6			36.1
Currency transactions, net		(8.0	)		4.2
Insurance recoveries		.2			.9
Infrastructure reimbursement		.7			4.3
Gain on land sales		—			12.5
Other, net		1.2			1.8
Total	$	15.7		$	59.8