SEGMENT INFORMATION - Schedule of Financial Information by Reportable Segment and Geography (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information
Net sales	$ 3,196.6	$ 3,241.2	$ 3,523.9
Inter-segment
Segment Reporting Information
Net sales	(9.2)	(9.1)	(12.2)
MS \| Operating Segments
Segment Reporting Information
Net sales	1,406.7	1,400.1	1,689.5
APS \| Operating Segments
Segment Reporting Information
Net sales	1,799.1	1,850.2	1,846.6
North America
Segment Reporting Information
Net sales	561.5	671.6	891.2
North America \| Inter-segment
Segment Reporting Information
Net sales	(9.2)	(9.1)	(12.2)
North America \| MS \| Operating Segments
Segment Reporting Information
Net sales	270.3	316.0	540.4
North America \| APS \| Operating Segments
Segment Reporting Information
Net sales	300.4	364.7	363.0
Taiwan
Segment Reporting Information
Net sales	735.9	662.7	590.7
Taiwan \| Inter-segment
Segment Reporting Information
Net sales	0.0	0.0	0.0
Taiwan \| MS \| Operating Segments
Segment Reporting Information
Net sales	279.1	238.8	232.0
Taiwan \| APS \| Operating Segments
Segment Reporting Information
Net sales	456.8	423.9	358.7
China
Segment Reporting Information
Net sales	657.7	671.2	566.9
China \| Inter-segment
Segment Reporting Information
Net sales	0.0	0.0	0.0
China \| MS \| Operating Segments
Segment Reporting Information
Net sales	268.1	257.0	197.0
China \| APS \| Operating Segments
Segment Reporting Information
Net sales	389.6	414.2	369.9
South Korea
Segment Reporting Information
Net sales	428.5	418.8	443.2
South Korea \| Inter-segment
Segment Reporting Information
Net sales	0.0	0.0	0.0
South Korea \| MS \| Operating Segments
Segment Reporting Information
Net sales	205.1	202.6	218.2
South Korea \| APS \| Operating Segments
Segment Reporting Information
Net sales	223.4	216.2	225.0
Japan
Segment Reporting Information
Net sales	317.6	309.4	367.3
Japan \| Inter-segment
Segment Reporting Information
Net sales	0.0	0.0	0.0
Japan \| MS \| Operating Segments
Segment Reporting Information
Net sales	139.8	128.5	105.0
Japan \| APS \| Operating Segments
Segment Reporting Information
Net sales	177.8	180.9	262.3
Europe
Segment Reporting Information
Net sales	239.4	275.5	402.4
Europe \| Inter-segment
Segment Reporting Information
Net sales	0.0	0.0	0.0
Europe \| MS \| Operating Segments
Segment Reporting Information
Net sales	100.7	115.8	229.4
Europe \| APS \| Operating Segments
Segment Reporting Information
Net sales	138.7	159.7	173.0
Southeast Asia
Segment Reporting Information
Net sales	256.0	232.0	262.2
Southeast Asia \| Inter-segment
Segment Reporting Information
Net sales	0.0	0.0	0.0
Southeast Asia \| MS \| Operating Segments
Segment Reporting Information
Net sales	143.6	141.4	167.5
Southeast Asia \| APS \| Operating Segments
Segment Reporting Information
Net sales	$ 112.4	$ 90.6	$ 94.7