OPERATING LEASES - Components of Lease Expense and Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease cost	$ 75.4	$ 82.9	$ 81.4
Variable lease cost	25.9	19.0	25.5
Less: sublease income	(2.3)	(1.6)	(1.9)
Total lease expense	99.0	100.3	$ 105.0
Cash outflows from operating leases included in the measurement of lease liabilities	80.8	70.7
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 22.7	$ 214.8