Commitments and contingencies (Tables)

9 Months Ended

Sep. 26, 2020

Commitments and Contingencies Disclosure [Abstract]

Schedule of warranty liabilities

The following summarizes the movements in the warranty liability for the nine months ended September 26, 2020 and September 28, 2019, respectively:

	Nine months ended
(dollars in millions)	September 26, 2020		September 28, 2019
Balance as of the beginning of the period	$	17.7	$	14.3
Charge for the period	9.3		10.2
Payments made	(6.6)		(7.4)
Released during the period	(0.7)		(1.0)
Foreign currency translation	0.1		(0.1)
Balance as of the end of the period	$	19.8	$	16.0