OTHER CURRENT ASSETS & OTHER CURRENT LIABILITIES - Other current assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Other Current Assets & Other Current Liabilities [Abstract]
Value-added tax receivables	$ 196.0	$ 185.6
Withholding tax and other receivables	96.8	137.8
Prepaid expenses	83.5	61.9
Held-to-maturity investments	1.3	15.1
Current financial assets at amortized cost	9.1	12.4
Other	27.3	42.2
Total other current assets	$ 414.0	$ 455.0