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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Fair value of long-term debt | Carrying amounts and the related estimated fair values of the Company’s long-term debt financial instruments not measured at fair value on a recurring basis at December 31, 2017 and December 25, 2016 are presented in the following table:
| As of December 31, 2017 |  | As of December 25, 2016
$ in millions | Principal |  | Carrying Amount |  | Fair Value |  | Principal |  | Carrying Amount |  | Fair Value
Long-term debt | $ | 300.8 |  |  | $ | 294.3 |  |  | $ | 312.7 |  |  | $ | 437.3 |  |  | $ | 432.0 |  |  | $ | 423.6 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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