Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2016

Investments Debt And Equity Securities [Abstract]

Schedule of Marketable Securities

	Market value		Cost basis		Unrealized losses, net
	(In millions)
December 31, 2015:
Current assets	$	2.0	$	2.0	$	—
Noncurrent assets:
The Amalgamated Sugar Company LLC	$	250.0	$	250.0	$	—
Other		4.9		5.1		(.2	)
Total	$	254.9	$	255.1	$	(.2	)
June 30, 2016:
Current assets	$	1.8	$	1.8	$	—
Noncurrent assets:
The Amalgamated Sugar Company LLC	$	250.0	$	250.0	$	—
Other		6.3		6.5		(.2	)
Total	$	256.3	$	256.5	$	(.2	)