Investments (Tables)

12 Months Ended

Dec. 28, 2012

Available-For-Sale Marketable Securities

At December 28, 2012, and December 30, 2011, available-for-sale marketable securities consisted of the following:

	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value
December 28, 2012
U.S. government debt obligations	$	31.1	$	—	$	—		$	31.1
Corporate debt obligations		9.5		0.1		—			9.6
Mortgaged backed debt obligations guaranteed by GNMA		54.9		0.6		—			55.5
Certificates of deposit guaranteed by FDIC		1.2		—		—			1.2
Foreign government debt obligations		159.3		1.8		—			161.1
Foreign corporate debt obligations guaranteed by foreign governments		121.5		0.7		—			122.2
Total	$	377.5	$	3.2	$	—		$	380.7
December 30, 2011
U.S. government debt obligations	$	195.2	$	0.5	$	—		$	195.7
Corporate debt obligations guaranteed by FDIC		66.6		0.2		—			66.8
Corporate debt obligations		201.4		0.8		(0.7	)		201.5
Mortgaged backed debt obligations guaranteed by GNMA		90.9		0.4		(0.1	)		91.2
Certificates of deposit guaranteed by FDIC		1.5		—		—			1.5
Foreign government debt obligations		221.5		1.5		—			223.0
Foreign corporate debt obligations guaranteed by foreign governments		64.1		0.2		(0.1	)		64.2
Total	$	841.2	$	3.6	$	(0.9	)	$	843.9

Maturities of Available-For-Sale Marketable Securities

The following table summarizes the maturities of our available-for-sale marketable securities at December 28, 2012:

	Amortized Cost		Fair Value
Less than 12 months	$	117.1	$	117.4
Due in 1 to 5 years		205.5		207.8
Due after 5 years		54.9		55.5
Total	$	377.5	$	380.7

Investments in Marketable Securities with Unrealized Losses

Investments in marketable securities with unrealized losses at December 30, 2011, were as follows:

	Unrealized Loss					Unrealized Loss				Fair Value		Total Unrealized Loss
	Less than 12 months					Greater than 12 months
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
December 30, 2011
Corporate debt obligations	$	81.0	$	(0.7	)	$	—	$	—	$	81.0	$	(0.7	)
Mortgaged backed debt obligations guaranteed by GNMA		31.4		(0.1	)		—		—		31.4		(0.1	)
Foreign government debt obligations guaranteed by foreign governments		24.1		(0.1	)		—		—		24.1		(0.1	)
Total	$	136.5	$	(0.9	)	$	—	$	—	$	136.5	$	(0.9	)

Gross Realized Gains and Losses Related to Fixed Income Investments

The following table presents gross realized gains and losses related to fixed income investments:

	2012			2011			2010
Gross realized gains	$	4.4		$	3.8		$	14.9
Gross realized losses 1		(1.3	)		(4.9	)		(2.7	)
Total	$	3.1		$	(1.1	)	$	12.2

¹  Includes other-than-temporary impairments of $1.2 million for the year ended December 30, 2011.