Marketable Securities (Tables)

12 Months Ended

Dec. 31, 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	)
December 31, 2018:
Current assets	$	2.5	$	2.5	$	—
Noncurrent assets	$	4.8	$	5.2	$	(.4	)

Schedule of Marketable Securities and Fair Value Measurements

	Fair Value Measurements
	Total		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
December 31, 2017:
Current assets	$	3.0	$	—	$	3.0	$	—
Noncurrent assets:
The Amalgamated Sugar Company LLC	$	250.0	$	—	$	—	$	250.0
Fixed income securities		4.4		—		4.4		—
Common stocks and exchange traded funds		1.3		1.3		—		—
Total	$	255.7	$	1.3	$	4.4	$	250.0
December 31, 2018:
Current assets	$	2.5	$	—	$	2.5	$	—
Noncurrent assets:
Fixed income securities	$	3.2	$	—	$	3.2	$	—
Common stocks and exchange traded funds		1.6		1.6		—		—
Total	$	4.8	$	1.6	$	3.2	$	—