Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2015

Investments Debt And Equity Securities [Abstract]

Schedule of Marketable Securities

	Market value		Cost basis		Unrealized losses, net
	(In millions)
December 31, 2014:
Current assets	$	2.7	$	2.7	$	—
Noncurrent assets:
The Amalgamated Sugar Company LLC	$	250.0	$	250.0	$	—
Other		5.6		5.8		(.2	)
Total	$	255.6	$	255.8	$	(.2	)
June 30, 2015:
Current assets	$	.9	$	.9	$	—
Noncurrent assets:
The Amalgamated Sugar Company LLC	$	250.0	$	250.0	$	—
Other		6.2		6.5		(.3	)
Total	$	256.2	$	256.5	$	(.3	)