Investments in Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2022

Marketable securities at September 30, 2022 and December 31, 2021 consisted of the following:

			UNREALIZED	UNREALIZED		FAIR
At September 30, 2022	COST		GAINS	LOSSES		VALUE
Marketable debt securities
U.S. tax-exempt securities	$	455.5		$	12.6	$	442.9
U.S. taxable municipal / non-U.S. provincial bonds		187.5			11.4		176.1
U.S. corporate securities		249.3			13.8		235.5
U.S. government and agency securities		112.3			3.3		109.0
Non-U.S. corporate securities		428.0			19.7		408.3
Non-U.S. government securities		73.1			3.0		70.1
Other debt securities		104.8			5.0		99.8
Marketable equity securities		15.4			12.9		2.5
Total marketable securities	$	1,625.9		$	81.7	$	1,544.2

			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 / 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 of marketable debt securities at September 30, 2022 were as follows: