PENSION AND POSTRETIREMENT BENEFITS (Benefit Obligations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 25, 2014	May 26, 2013	May 27, 2012
Pension Benefits
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss
Net actuarial (gain) loss	$ (12.7)	$ (110.2)
Amendments	2.2	6.8
Amortization of prior service (cost) benefit	(3.8)	(4.4)
Recognized net actuarial (loss)	(2.7)	(3.6)	(396.9)
Net amount recognized	(17.0)	(111.4)
Other Benefits
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss
Net actuarial (gain) loss	(4.9)	(7.7)
Amendments	(5.7)	0
Amortization of prior service (cost) benefit	7.2	8.2
Recognized net actuarial (loss)	(6.7)	(5.9)	(7.6)
Net amount recognized	$ (10.1)	$ (5.4)