Debt (Tables)

12 Months Ended

Dec. 25, 2016

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 25, 2016 and December 27, 2015 are presented in the following table:

	As of December 25, 2016						As of December 27, 2015
$ in millions	Principal		Carrying Amount		Fair Value		Principal		Carrying Amount		Fair Value
Long-term debt	$	437.3	$	432.0	$	423.6	$	452.7	$	445.1	$	315.2