Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2018

Investments Debt And Equity Securities [Abstract]

Schedule of Marketable Securities

	Market value		Cost basis		Unrealized losses, net
	(In millions)
December 31, 2017:
Current assets	$	3.0		3.0		—
Noncurrent assets:
The Amalgamated Sugar Company LLC	$	250.0		250.0		—
Other		5.7		5.9		(.2	)
Total	$	255.7		255.9		(.2	)
September 30, 2018:
Current assets	$	2.2		2.2		—
Noncurrent assets	$	5.1	$	5.4	$	(.3	)