Condensed Consolidated Statements of Comprehensive Income (loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 24, 2021	Sep. 30, 2022	Sep. 24, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 12.9	$ 34.0	$ 22.0	$ 77.6
Other comprehensive loss:
Change in cumulative translation adjustment, net of tax	(10.5)	(3.5)	(22.5)	(4.1)
Change in fair value of derivatives, net of tax	(0.4)	(0.2)	(1.5)	(0.1)
Total other comprehensive loss	(10.9)	(3.7)	(24.0)	(4.2)
Comprehensive income (loss)	2.0	30.3	(2.0)	73.4
Comprehensive income (loss), attributable to noncontrolling interests	(4.5)	2.1	1.8	3.6
Comprehensive income (loss) attributable to UCT	$ 6.5	$ 28.2	$ (3.8)	$ 69.8