Debt (Tables)

12 Months Ended

Dec. 28, 2014

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 29, 2013 and December 28, 2014 are presented in the following table:

	As of December 29, 2013						As of December 28, 2014
$ in millions	Principal		Carrying Amount		Fair Value		Principal		Carrying Amount		Fair Value
Long-term debt	$	629.8	$	644.3	$	679.7	$	669.8	$	664.0	$	577.1