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Commitments and contingencies (Tables)
 9 Months Ended
Sep. 28, 2019
Commitments and Contingencies Disclosure [Abstract]  
Schedule of warranty liabilities
The following summarizes the movements in the warranty liability for the nine month periods ended September 28, 2019 and September 29, 2018, respectively:
 
Nine months ended
(dollars in millions)
September 28,
2019
 
September 29,
2018
Balance as of the beginning of the fiscal year
$
14.3

 
$
14.1

Charge for the period
10.2

 
9.2

Payments made
(7.4
)
 
(7.3
)
Released during the period
(1.0
)
 
(0.6
)
Foreign currency translation
(0.1
)
 
(0.2
)
Balance as of the end of the period
$
16.0

 
$
15.2