PENSION AND POSTRETIREMENT BENEFITS - Schedule of Changes in Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	May 26, 2019	May 27, 2018	May 28, 2017
Change in Plan Assets
Fair value of plan assets at beginning of year	$ 3,355.1
Fair value of plan assets at end of year	3,601.5	$ 3,355.1
Pension Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	3,423.6	3,548.7
Service cost	10.9	42.8	$ 56.9
Interest cost	132.6	111.1	116.8
Plan participants' contributions	0.0	0.0
Amendments	1.4	0.6
Actuarial loss (gain)	150.1	(9.4)
Plan settlements	0.0	(10.2)
Curtailments	0.0	(79.5)
Benefits paid	(191.2)	(181.3)
Currency	(0.6)	0.8
Business acquisitions and divestitures	206.4	0.0
Benefit obligation at end of year	3,733.2	3,423.6	3,548.7
Change in Plan Assets
Fair value of plan assets at beginning of year	3,355.1	2,983.6
Actual return on plan assets	252.2	249.6
Employer contributions	14.7	312.6
Plan participants' contributions	0.0	0.0
Plan settlements	0.0	(10.2)	(287.5)
Benefits paid	(191.2)	(181.3)
Currency	(0.6)	0.8
Business acquisitions and divestitures	171.3	0.0
Fair value of plan assets at end of year	3,601.5	3,355.1	2,983.6
Other Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	119.3	156.9
Service cost	0.1	0.2	0.3
Interest cost	3.8	3.9	4.6
Plan participants' contributions	2.5	4.7
Amendments	(0.8)	(17.2)
Actuarial loss (gain)	(24.3)	(13.2)
Plan settlements	(0.5)	0.0
Curtailments	(0.6)	0.0
Benefits paid	(9.8)	(16.2)
Currency	(0.2)	0.2
Business acquisitions and divestitures	1.7	0.0
Benefit obligation at end of year	91.2	119.3	156.9
Change in Plan Assets
Fair value of plan assets at beginning of year	3.7	0.0
Actual return on plan assets	0.2	3.7
Employer contributions	7.3	11.5
Plan participants' contributions	2.5	4.7
Plan settlements	(0.5)	0.0
Benefits paid	(9.8)	(16.2)
Currency	0.0	0.0
Business acquisitions and divestitures		0.0
Fair value of plan assets at end of year	$ 3.4	$ 3.7	$ 0.0