SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEGMENT INFORMATION
Stock-based compensation expense	$ 64.1	$ 70.5	$ 70.3
Corporate and Unallocated
SEGMENT INFORMATION
Payroll costs	278.7	258.6	234.1
Stock-based compensation expense	63.1	70.3	69.9
Professional service expenses	87.1	77.9	67.6
Insurance costs	10.5	9.3	7.5
Other operating expenses	$ 58.3	$ 28.1	$ 39.0