FAIR VALUE MEASUREMENTS - Assets and liabilities measured on a recurring basis (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets
Foreign exchange contracts	$ 110.4	$ 147.4
Liabilities
Derivative financial instruments	101.3	207.7
Fair value, measurements, recurring
Assets
Equity securities	24.3	19.8
Money market and stable value funds	2.1	1.9
Held-to-maturity debt securities	1.3	16.0
Foreign exchange contracts	213.8	289.9
Total assets	241.5	327.6
Liabilities
Derivative financial instruments	204.7	350.2
Total liabilities	204.7	350.2
Fair value, measurements, recurring | Level 1
Assets
Equity securities	24.3	19.8
Money market and stable value funds	0.0	0.0
Held-to-maturity debt securities	0.0	0.0
Foreign exchange contracts	0.0	0.0
Total assets	24.3	19.8
Liabilities
Derivative financial instruments	0.0	0.0
Total liabilities	0.0	0.0
Fair value, measurements, recurring | Level 2
Assets
Equity securities	0.0	0.0
Money market and stable value funds	1.7	1.5
Held-to-maturity debt securities	1.3	16.0
Foreign exchange contracts	213.8	289.9
Total assets	216.8	307.4
Liabilities
Derivative financial instruments	204.7	350.2
Total liabilities	204.7	350.2
Fair value, measurements, recurring | Level 3
Assets
Equity securities	0.0	0.0
Money market and stable value funds	0.0	0.0
Held-to-maturity debt securities	0.0	0.0
Foreign exchange contracts	0.0	0.0
Total assets	0.0	0.0
Liabilities
Derivative financial instruments	0.0	0.0
Total liabilities	$ 0.0	$ 0.0