OTHER CURRENT ASSETS & OTHER CURRENT LIABILITIES - Other Current Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other Current Assets & Other Current Liabilities [Abstract]
Value - added tax receivables	$ 222.4	$ 256.9
Sundry receivables	106.1	138.4
Other taxes receivables	70.6	73.8
Prepaid expenses	50.7	78.1
Current financial assets at amortized cost	21.9	40.6
Held-to-maturity investments	8.8	24.2
Assets held for sale	5.0	47.3
Other	26.8	24.1
Total other current assets	$ 512.3	$ 683.4