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RESTRICTED CASH AND INVESTMENTS (Tables) | 12 Months Ended
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Dec. 27, 2013
Restricted Cash and Investments [Abstract] |
Schedule of restricted cash and investments | The following is a summary of restricted cash and investments (in millions):
| December 27, 2013 |  | December 28, 2012
Cash collateral held by insurance carriers | $ | 23.7 |  |  | $ | 21.5 |
Cash and cash equivalents held in Trust (1) | 31.5 |  |  | 14.8 |
Investments held in Trust | 86.7 |  |  | 91.2 |
Cash collateral backing letters of credit | 1.9 |  |  | 1.8 |
Other (2) | 10.8 |  |  | 7.0 |
Total restricted cash and investments | $ | 154.6 |  |  | $ | 136.3 |
(1) | Included in this amount is $0.8 million and $0.9 million of accrued interest at December 27, 2013 and December 28, 2012, respectively.
(2) | Primarily 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):
| 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 |
| December 28, 2012
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
Municipal debt securities | $ | 57.3 |  |  | $ | 1.0 |  |  | $ | (0.1 | ) |  | $ | 58.2 |
Corporate debt securities | 17.9 |  |  | 0.3 |  |  | — |  |  | 18.2 |
Asset-backed securities | 16.0 |  |  | 0.3 |  |  | — |  |  | 16.3 |
| $ | 91.2 |  |  | $ | 1.6 |  |  | $ | (0.1 | ) |  | $ | 92.7 |
Schedule of held-to-maturity investments by contractual maturity | The amortized cost and fair value by contractual maturity of our available-for-sale investments are as follows (in millions):
| December 27, 2013
| Amortized Cost |  | Fair Value
Due in one year or less (1) | $ | 14.8 |  |  | $ | 14.7 |
Due after one year (2) | 6.0 |  |  | 6.0 |
| $ | 20.8 |  |  | $ | 20.7 |
The amortized cost and fair value by contractual maturity of our held-to-maturity investments are as follows (in millions):
| December 27, 2013
| Amortized Cost |  | Fair Value
Due in one year or less | $ | 10.2 |  |  | $ | 10.2 |
Due after one year through five years | 42.1 |  |  | 42.8 |
Due after five years through ten years | 34.4 |  |  | 33.9 |
| $ | 86.7 |  |  | $ | 86.9 |

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