FAIR VALUE MEASUREMENTS - Fair Value Hierarchy (Details) - USD ($) $ in Millions	May 31, 2020	May 26, 2019
Liabilities:
Deferred compensation liabilities	$ 18.0	$ 15.1
Recurring
Assets:
Pension plan assets	27.2	17.1
Deferred compensation assets	0.1	0.5
Derivative assets		0.4
Total assets	27.3	18.0
Liabilities:
Derivative liabilities	4.7	3.8
Deferred compensation liabilities	18.0	15.1
Total liabilities	22.7	18.9
Recurring | Level 1
Assets:
Pension plan assets	19.2	11.8
Deferred compensation assets	0.1	0.5
Total assets	19.3	12.3
Recurring | Level 2
Assets:
Pension plan assets	8.0	5.3
Derivative assets		0.4
Total assets	8.0	5.7
Liabilities:
Derivative liabilities	4.7	3.8
Deferred compensation liabilities	18.0	15.1
Total liabilities	$ 22.7	$ 18.9