Debt (Tables)

9 Months Ended

Sep. 27, 2015

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 28, 2014 and September 27, 2015 are presented in the following table:

	As of December 28, 2014						As of September 27, 2015
$ in millions	Principal		Carrying Amount		Fair Value		Principal		Carrying Amount		Fair Value
Total long-term debt including current portion	$	669.8	$	664.0	$	577.1	$	453.0	$	449.5	$	367.2