Other Income, Net (Tables)

6 Months Ended

Jun. 30, 2018

Other Income And Expenses [Abstract]

Schedule of Components of Other Income

	Six months ended June 30,
	2017			2018
	(In millions)
Securities earnings:
Dividends and interest	$	14.1		$	16.8
Currency transactions, net		(3.7	)		4.8
Insurance recoveries		.1			.4
Infrastructure reimbursement		.2			4.0
Gain on land sales		—			12.5
Other, net		.7			1.2
Total	$	11.4		$	39.7