Investments in Marketable Debt Securities (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Marketable Debt Securities

Marketable debt securities at June 30, 2015 and December 31, 2014 consisted of the following:

At June 30, 2015	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
U.S. tax-exempt securities	$	495.6	$	1.0	$	.3	$	496.3
U.S. corporate securities		74.5		.2		.1		74.6
U.S. government and agency securities		8.1		.1				8.2
Non-U.S. corporate securities		551.8		2.6		.5		553.9
Non-U.S. government securities		178.5		1.4		.1		179.8
Other debt securities		84.1		.4				84.5
	$	1,392.6	$	5.7	$	1.0	$	1,397.3
At December 31, 2014	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
U.S. tax-exempt securities	$	362.9	$	.8	$	.3	$	363.4
U.S. corporate securities		80.9		.6				81.5
U.S. government and agency securities		8.0						8.0
Non-U.S. corporate securities		528.1		3.9				532.0
Non-U.S. government securities		192.1		2.0				194.1
Other debt securities		92.8		.3		.1		93.0
	$	1,264.8	$	7.6	$	.4	$	1,272.0

Marketable Debt Securities Continuous Unrealized Losses

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

	June 30, 2015			December 31, 2014
	Less than Twelve Months		Twelve Months or Greater	Less than Twelve Months		Twelve Months or Greater
Fair value	$	409.0		$	249.6
Unrealized losses		1.0			.4

Contractual Maturities of Debt Securities

Contractual maturities on marketable debt securities at June 30, 2015 were as follows:

Maturities:	Amortized Cost		Fair Value
Within one year	$	394.1	$	394.8
One to five years		998.3		1,002.3
Six to ten years		.2		.2
	$	1,392.6	$	1,397.3