Debt (Tables)

3 Months Ended

Apr. 01, 2018

Debt Disclosure [Abstract]

Carrying Amounts and Estimated 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 April 1, 2018 and December 31, 2017 are presented in the following table:

	As of April 1, 2018						As of December 31, 2017
$ in millions	Principal		Carrying Amount		Fair Value		Principal		Carrying Amount		Fair Value
Total long-term debt including current portion	$	300.5	$	294.1	$	312.5	$	300.8	$	294.3	$	312.7