SEGMENT INFORMATION - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets
Long-lived assets	$ 276.8	$ 296.9
United States
Revenues from External Customers and Long-Lived Assets
Long-lived assets	94.9	94.7
China
Revenues from External Customers and Long-Lived Assets
Long-lived assets	35.7	39.4
Other countries
Revenues from External Customers and Long-Lived Assets
Long-lived assets	$ 146.2	$ 162.8