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RESTRICTED CASH AND INVESTMENTS (Tables)
 3 Months Ended
Mar. 28, 2014
Restricted Cash and Investments [Abstract]  
Schedule of restricted cash and investments
The following is a summary of restricted cash and investments (in millions):
 
March 28,
2014
 
December 27,
2013
Cash collateral held by insurance carriers
$
23.0

 
$
23.7

Cash and cash equivalents held in Trust (1)
37.1

 
31.5

Investments held in Trust
81.9

 
86.7

Cash collateral backing letters of credit
1.9

 
1.9

Other (2)
7.5

 
10.8

Total restricted cash and investments
$
151.4

 
$
154.6


(1)
Included in this amount is $0.8 million of accrued interest at March 28, 2014 and December 27, 2013.
(2)
Consists of restricted cash in money market accounts and deferred compensation plan accounts, which are comprised of mutual funds.
Schedule of held-to-maturity investments
The following tables present fair value disclosures for our held-to-maturity investments, which are carried at amortized cost (in millions):
 
March 28, 2014
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Fair Value
Municipal debt securities
$
50.2

 
$
0.8

 
$
(0.3
)
 
$
50.7

Corporate debt securities
19.6

 
0.2

 
(0.2
)
 
19.6

Asset-backed securities
12.1

 
0.2

 
—

 
12.3

 
$
81.9

 
$
1.2

 
$
(0.5
)
 
$
82.6

 
December 27, 2013
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Fair Value
Municipal debt securities
$
54.1

 
$
0.7

 
$
(0.4
)
 
$
54.4

Corporate debt securities
19.7

 
0.2

 
(0.3
)
 
19.6

Asset-backed securities
12.9

 
0.1

 
(0.1
)
 
12.9

 
$
86.7

 
$
1.0

 
$
(0.8
)
 
$
86.9
Schedule of held-to-maturity investments by contractual maturity
The amortized cost and fair value by contractual maturity of our marketable securities are as follows (in millions):
 
March 28, 2014
 
Amortized Cost
 
Fair Value
Due in one year or less (1)
$
31.8

 
$
31.8

Due after one year (2)
4.5

 
4.5

 
$
36.3

 
$
36.3


(1)
Amounts due in one year or less include CDs, corporate debt securities, municipal debt securities, commercial paper, and a VRDN. As of March 28, 2014, the VRDN had a contractual maturity date greater than 18 years. Although this security is issued as long-term, it is priced and traded as short-term because of the high liquidity provided through the tender feature. It is not our intent to hold to maturity.
(2)
Amounts due after one year include CDs with maturities within two years and are recorded in Other assets on the Consolidated Balance Sheets.
The amortized cost and fair value by contractual maturity of our held-to-maturity investments are as follows (in millions):
 
March 28, 2014
 
Amortized Cost
 
Fair Value
Due in one year or less
$
10.9

 
$
10.9

Due after one year through five years
41.2

 
41.9

Due after five years through ten years
29.8

 
29.8

 
$
81.9

 
$
82.6