SEGMENT INFORMATION - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets
Long-Lived assets	$ 296.9	$ 277.2
United States
Revenues from External Customers and Long-Lived Assets
Long-Lived assets	94.7	89.7
China
Revenues from External Customers and Long-Lived Assets
Long-Lived assets	39.4	42.3
Other countries
Revenues from External Customers and Long-Lived Assets
Long-Lived assets	$ 162.8	$ 145.2