Other Income, Net (Tables)

12 Months Ended

Dec. 31, 2017

Other Income And Expenses [Abstract]

Schedule of Components of Other Income

	Years ended December 31,
	2015			2016			2017
	(In millions)
Securities earnings:
Dividends and interest	$	26.4		$	26.7		$	29.4
Securities transactions, net		—			.5			.1
Total		26.4			27.2			29.5
Insurance recoveries		3.7			.4			.4
Currency transactions, net		(.1	)		5.5			(7.5	)
Disposal of property and equipment, net		(.8	)		(.3	)		(.5	)
Business interruption insurance proceeds		—			4.3			—
Infrastructure reimbursement		.2			.6			1.0
Other, net		2.5			1.3			2.3
Total	$	31.9		$	39.0		$	25.2