RESTRICTED CASH AND INVESTMENTS

Restricted cash and investments consist principally of collateral that has been provided or pledged to insurance carriers for workers' compensation and state workers' compensation programs. Our insurance carriers and certain state workers' compensation programs require us to collateralize a portion of our workers' compensation obligation. The collateral typically takes the form of cash and cash equivalents and highly rated investment grade securities, primarily in U.S. Treasury Securities, U.S. Agency Debentures, U.S. Agency Mortgages, Corporate Securities and Municipal Securities. The majority of our collateral obligations are held in a trust ("Trust") at the Bank of New York Mellon.

The following is a summary of restricted cash and investments (in millions):



	December 28, 2012		December 30, 2011
Cash collateral held by insurance carriers	$	21.5	$	21.3
Cash and cash equivalents held in Trust (1)	14.8		19.2
Investments held in Trust	91.2		78.0
Cash collateral backing letters of credit	1.8		5.9
Other (2)	7.0		6.1
Total restricted cash and investments	$	136.3	$	130.5

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(1)	Included in this amount is $0.9 million and $0.8 million of accrued interest at December 28, 2012 and December 30, 2011, respectively.


(2)	Primarily consists of restricted cash in money market accounts and deferred compensation plan accounts which are comprised of mutual funds.

The following tables present fair value disclosures for our held-to-maturity investments which are carried at amortized cost (in millions):



	December 28, 2012
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Municipal securities	$	57.3	$	1.0	$	(0.1	)	$	58.2
Corporate bonds	17.9		0.3		—			18.2
Asset backed bonds	16.0		0.3		—			16.3
	$	91.2	$	1.6	$	(0.1	)	$	92.7



	December 30, 2011
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Municipal securities	$	42.8	$	0.8	$	(0.1	)	$	43.5
Corporate bonds	16.1		0.2		—			16.3
Asset backed bonds	13.6		0.1		—			13.7
State government and agency securities	4.5		—		—			4.5
United States Treasury securities	1.0		—		—			1.0
	$	78.0	$	1.1	$	(0.1	)	$	79.0

The amortized cost and fair value by contractual maturity of our held-to-maturity investments are as follows (in millions):



	December 28, 2012
	Amortized Cost		Fair Value
Due in one year or less	$	11.8	$	11.8
Due after one year through five years	43.3		44.1
Due after five years through ten years	36.1		36.8
	$	91.2	$	92.7

Actual maturities may differ from contractual maturities because the issuers of certain debt securities have the right to call or prepay their obligations without penalty.