Investments in Marketable Debt Securities (Tables)

9 Months Ended

Sep. 30, 2012

Marketable Debt Securities

Marketable debt securities at September 30, 2012 and December 31, 2011 consisted of the following:

At September 30, 2012	AMORTIZED COST		UNREALIZED GAINS		UNREALIZED LOSSES		FAIR VALUE
U.S. tax-exempt securities	$	299.7	$	2.6			$	302.3
U.S. corporate securities		27.9		.3				28.2
U.S. government and agency securities		1.2						1.2
Non-U.S. government securities		386.1		7.4				393.5
Non-U.S. corporate securities		150.3		1.1				151.4
Other debt securities		78.6		.7				79.3
	$	943.8	$	12.1			$	955.9
At December 31, 2011	AMORTIZED COST		UNREALIZED GAINS		UNREALIZED LOSSES		FAIR VALUE
U.S. tax-exempt securities	$	291.9	$	2.6	$	.1	$	294.4
U.S. corporate securities		27.4		.3		.2		27.5
U.S. government and agency securities		1.9						1.9
Non-U.S. government securities		361.2		6.0		.1		367.1
Non-U.S. corporate securities		148.0		.5		.2		148.3
Other debt securities		70.3		.6				70.9
	$	900.7	$	10.0	$	.6	$	910.1

Contractual Maturities of Marketable Debt Securities

Contractual maturities on marketable debt securities at September 30, 2012 were as follows:

Maturities:	AMORTIZED COST		FAIR VALUE
Within one year	$	326.6	$	328.3
One to five years		615.7		626.1
Six to ten years		.2		.2
More than ten years		1.3		1.3
	$	943.8	$	955.9