Marketable securities

12 Months Ended

Dec. 31, 2024

Marketable securities

Marketable securities

Note 6 – Marketable securities:

			Cost or
			amortized		Unrealized
	Market value		cost		loss, net
	(In millions)
December 31, 2023:
Current assets	$	56.1	$	56.1	$	—
Noncurrent assets	$	4.8	$	5.0	$	(.2)
December 31, 2024:
Current assets	$	1.9	$	1.9	$	—
Noncurrent assets	$	5.7	$	5.7	$	—

	Fair Value Measurements
			Quoted		Significant
			Prices in		Other
			Active		Observable
			Markets		Inputs
	Total		(Level 1)		(Level 2)
	(In millions)
December 31, 2023:
Current assets - fixed income securities	$	56.1	$	—	$	56.1
Noncurrent assets:
Fixed income securities	$	2.6	$	—	$	2.6
Mutual funds		2.2		2.2		—
Total	$	4.8	$	2.2	$	2.6
December 31, 2024:
Current assets - fixed income securities	$	1.9	$	—	$	1.9
Noncurrent assets:
Fixed income securities	$	3.1	$	—	$	3.1
Mutual funds		2.6		2.6		—
Total	$	5.7	$	2.6	$	3.1

Our marketable securities consist of investments in marketable equity and debt securities. At December 31, 2023 and 2024 our current marketable securities were primarily debt securities invested in U.S. government treasuries. The fair values of our marketable debt securities are either determined using Level 1 inputs (because securities are actively traded) or determined using Level 2 inputs (because although these securities are traded, in many cases, the market is not active and the year-end valuation is generally based on the last trade of the year, which may be several days prior to December 31).