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COMMITMENTS AND CONTINGENCIES - Workers' Compensation Commitments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 27, 2013 | Dec. 28, 2012
Workers' Compensation Commitments [Line Items] |  |  |  |
Cash collateral held by insurance carriers | $ 23.7 |  | $ 21.5 |
Cash and cash equivalents held in Trust | 31.5 |  | 14.8 | [1]
Investments held in Trust | 86.7 |  | 91.2 |
Letters of credit | 7.9 | [2] | 9.0 | [2]
Surety bonds | 16.1 | [3] | 16.2 | [3]
Total collateral commitments | 165.9 |  | 152.7 |
Accrued interest on trust investments | 0.8 |  | 0.9 |
Cash collateral backing letters of credit | $ 1.9 |  | $ 1.8 |
Surety bonds annual fee limit, % of bond amount | 2.00% |  |  |
Surety bonds required cancellation notice | 60 days |  |  |
Minimum |  |  |  |
Workers' Compensation Commitments [Line Items] |  |  |  |
Surety bonds review and renewal period if elected | 1 year |  |  |
Maximum |  |  |  |
Workers' Compensation Commitments [Line Items] |  |  |  |
Surety bonds review and renewal period if elected | 4 years |  |  |
[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] | We have agreements with certain financial institutions to issue letters of credit as collateral. We had $1.9 million and $1.8 million of restricted cash collateralizing our letters of credit at December 27, 2013 and December 28, 2012, respectively.
[3] | Our surety bonds are issued by independent insurance companies on our behalf and bear annual fees based on a percentage of the bond, which is determined by each independent surety carrier. These fees do not exceed 2.0% of the bond amount, subject to a minimum charge. The terms of these bonds are subject to review and renewal every one to four years and most bonds can be canceled by the sureties with as little as 60 days notice

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