Investments in Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2023

Marketable securities at March 31, 2023 and December 31, 2022 consisted of the following:

			UNREALIZED		UNREALIZED		FAIR
At March 31, 2023	COST		GAINS		LOSSES		VALUE
Marketable debt securities
U.S. tax-exempt securities	$	418.2	$	.6	$	5.5	$	413.3
U.S. taxable municipal / non-U.S. provincial bonds		207.9		.1		8.6		199.4
U.S. corporate securities		281.7		.5		9.4		272.8
U.S. government and agency securities		134.4		.4		2.0		132.8
Non-U.S. corporate securities		449.4		.2		14.7		434.9
Non-U.S. government securities		83.7		.2		2.1		81.8
Other debt securities		106.3		.1		3.9		102.5
Marketable equity securities		10.0				8.6		1.4
Total marketable securities	$	1,691.6	$	2.1	$	54.8	$	1,638.9

			UNREALIZED		UNREALIZED		FAIR
At December 31, 2022	COST		GAINS		LOSSES		VALUE
Marketable debt securities
U.S. tax-exempt securities	$	452.8	$	.5	$	8.2	$	445.1
U.S. taxable municipal / non-U.S. provincial bonds		191.6				10.8		180.8
U.S. corporate securities		262.5		.1		11.6		251.0
U.S. government and agency securities		118.0		.1		3.1		115.0
Non-U.S. corporate securities		467.9				17.9		450.0
Non-U.S. government securities		78.9		.2		2.7		76.4
Other debt securities		99.4				4.7		94.7
Marketable equity securities		10.0				8.8		1.2
Total marketable securities	$	1,681.1	$	.9	$	67.8	$	1,614.2

Marketable debt securities with continuous unrealized losses and their related fair values were as follows:

Contractual maturities of marketable debt securities at March 31, 2023 were as follows: