Marketable Securities (Tables)

3 Months Ended

Mar. 29, 2015

Summary of Securities

Our marketable securities are categorized as available-for-sale and are summarized as follows:

	As of March 29, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In millions)
U.S. Treasury securities and obligations of U.S. government agencies	$	0.2	$	—	$	—	$	0.2
Total short-term marketable securities	$	0.2	$	—	$	—	$	0.2
U.S. Treasury securities and obligations of U.S. government agencies	$	1.7	$	0.2	$	—	$	1.9
Corporate debt securities		0.1		—		—		0.1
Total long-term marketable securities	$	1.8	$	0.2	$	—	$	2.0
	As of December 28, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(In millions)
U.S. Treasury securities and obligations of U.S. government agencies	$	0.1	$	—	$	—	$	0.1
Total short-term marketable securities	$	0.1	$	—	$	—	$	0.1
U.S. Treasury securities and obligations of U.S. government agencies	$	1.8	$	0.2	$	—	$	2.0
Corporate debt securities		0.2		—		—		0.2
Total long-term marketable securities	$	2.0	$	0.2	$	—	$	2.2

Schedule of Available-for-Sale Securities by Contractual Maturity

The amortized cost and estimated fair value of our marketable securities available-for-sale by contractual maturity are summarized as follows:

	As of March 29, 2015
	Amortized Cost		Fair Value
	(In millions)
Due in one year or less	$	0.2	$	0.2
Due after one year through five years		0.7		0.8
Due after five years		1.1		1.2
	$	2.0	$	2.2