FAIR VALUE MEASUREMENTS - Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Feb. 28, 2021	May 31, 2020
Assets:
Derivative assets	$ 8.8	$ 8.0
Marketable securities	7.2	8.1
Deferred compensation assets	8.5	8.6
Total assets	24.5	24.7
Liabilities:
Derivative liabilities	3.5	0.4
Deferred compensation liabilities	77.6	68.0
Total liabilities	81.1	68.4
Level 1
Assets:
Derivative assets	5.6	2.8
Marketable securities	7.2	8.1
Deferred compensation assets	8.5	8.6
Total assets	21.3	19.5
Liabilities:
Derivative liabilities	0.0	0.0
Deferred compensation liabilities	77.6	68.0
Total liabilities	77.6	68.0
Level 2
Assets:
Derivative assets	3.2	5.2
Marketable securities	0.0	0.0
Deferred compensation assets	0.0	0.0
Total assets	3.2	5.2
Liabilities:
Derivative liabilities	3.5	0.4
Deferred compensation liabilities	0.0	0.0
Total liabilities	3.5	0.4
Level 3
Assets:
Derivative assets	0.0	0.0
Marketable securities	0.0	0.0
Deferred compensation assets	0.0	0.0
Total assets	0.0	0.0
Liabilities:
Derivative liabilities	0.0	0.0
Deferred compensation liabilities	0.0	0.0
Total liabilities	$ 0.0	$ 0.0