Revenue Recognition (Tables)

6 Months Ended

Jun. 26, 2020

Revenue From Contract With Customer [Abstract]

Revenue by Geographic Area

The following table sets forth revenue by geographic area (in millions):

	Three Months Ended				Six Months Ended
	June 26,		June 28,		June 26,		June 28,
	2020		2019		2020		2019
United States	$	155.1	$	133.0	$	297.7	$	270.3
Singapore		119.6		75.9		231.8		144.2
South Korea		21.3		17.7		41.6		36.1
Taiwan		15.0		10.7		30.2		19.6
Austria		13.0		10.3		27.5		24.5
China		12.0		12.4		21.1		20.4
Other		8.8		5.4		15.8		10.4
	$	344.8	$	265.4	$	665.7	$	525.5