Investments in Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2022

Marketable securities consisted of the following at December 31:

			UNREALIZED		UNREALIZED		FAIR
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

			UNREALIZED		UNREALIZED		FAIR
2021	COST		GAINS		LOSSES		VALUE
Marketable debt securities
U.S. tax-exempt securities	$	431.4	$	1.5	$	.4	$	432.5
U.S. taxable municipal / non-U.S. provincial bonds		192.2		.6		1.2		191.6
U.S. corporate securities		208.3		.6		1.5		207.4
U.S. government and agency securities		95.9		.6		.1		96.4
Non-U.S. corporate securities		443.9		1.4		2.5		442.8
Non-U.S. government securities		75.2		.1		.3		75.0
Other debt securities		100.4		.3		.7		100.0
Marketable equity securities		15.4		1.3		3.0		13.7
Total marketable securities	$	1,562.7	$	6.4	$	9.7	$	1,559.4

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

Contractual maturities on marketable debt securities at December 31, 2022 were as follows: