SEGMENT INFORMATION - Operations in Geographical Areas (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Property, Plant and Equipment, Net [Line Items]
Property, plant and equipment, net	$ 439.8	$ 421.9
United States
Revenues from External Customers and Property, Plant and Equipment, Net [Line Items]
Property, plant and equipment, net	369.0	303.1
Switzerland
Revenues from External Customers and Property, Plant and Equipment, Net [Line Items]
Property, plant and equipment, net	14.3	20.5
All other (each country individually less than 5% of total property, plant and equipment, net)
Revenues from External Customers and Property, Plant and Equipment, Net [Line Items]
Property, plant and equipment, net	$ 56.5	$ 98.3