Investments in Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2022

Marketable securities at March 31, 2022 and December 31, 2021 consisted of the following:

			UNREALIZED		UNREALIZED		FAIR
At March 31, 2022	COST		GAINS		LOSSES		VALUE
Marketable debt securities
U.S. tax-exempt securities	$	447.3	$	.1	$	7.3	$	440.1
U.S. taxable municipal/ provincial bonds		181.6		.1		6.4		175.3
U.S. corporate securities		212.0				6.9		205.1
U.S. government and agency securities		89.4		.1		1.1		88.4
Non-U.S. corporate securities		441.1		.1		10.1		431.1
Non-U.S. government securities		72.1				1.4		70.7
Other debt securities		100.8		.1		3.0		97.9
Marketable equity securities		15.4				8.8		6.6
Total marketable securities	$	1,559.7	$	.5	$	45.0	$	1,515.2

			UNREALIZED		UNREALIZED		FAIR
At December 31, 2021	COST		GAINS		LOSSES		VALUE
Marketable debt securities
U.S. tax-exempt securities	$	431.4	$	1.5	$	.4	$	432.5
U.S. taxable municipal/ 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 of marketable debt securities at March 31, 2022 were as follows: