Investments in Marketable Debt Securities (Tables)

3 Months Ended

Mar. 31, 2013

Marketable Debt Securities

Marketable debt securities at March 31, 2013 and December 31, 2012 consisted of the following:

At March 31, 2013	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
U.S. tax-exempt securities	$	219.7	$	1.7			$	221.4
U.S. corporate securities		65.4		.3				65.7
U.S. government and agency securities		.4		.1				.5
Non-U.S. government securities		333.0		5.4				338.4
Non-U.S. corporate securities		437.6		1.3	$	.3		438.6
Other debt securities		112.7		.5		.1		113.1
	$	1,168.8	$	9.3	$	.4	$	1,177.7
At December 31, 2012	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
U.S. tax-exempt securities	$	217.2	$	1.5	$	.1	$	218.6
U.S. corporate securities		59.8		.3				60.1
U.S. government and agency securities		.8						.8
Non-U.S. government securities		349.3		5.8		.1		355.0
Non-U.S. corporate securities		447.5		1.4		.2		448.7
Other debt securities		108.9		.6				109.5
	$	1,183.5	$	9.6	$	.4	$	1,192.7

Contractual Maturities of Marketable Debt Securities

Contractual maturities on marketable debt securities at March 31, 2013 were as follows:

Maturities:	Amortized Cost		Fair Value
Within one year	$	508.8	$	512.0
One to five years		659.8		665.5
Six to ten years		.2		.2
	$	1,168.8	$	1,177.7