SEGMENT INFORMATION - Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
SEGMENT INFORMATION
Stock-based compensation expense	$ 27.5	$ 17.9	$ 68.8	$ 52.5
Corporate and unallocated
SEGMENT INFORMATION
Payroll costs	96.6	82.7	282.7	245.5
Stock-based compensation expense	27.3	17.4	67.0	51.1
Professional service expenses	22.4	27.3	56.9	74.7
Other operating expenses	$ 41.8	$ 25.4	$ 89.9	$ 59.9