PENSION AND POSTRETIREMENT BENEFITS (Tables)

9 Months Ended

Feb. 25, 2018

Retirement Benefits [Abstract]

Components of Pension Benefit and Other Postretirement Benefit Costs

Components of pension benefit and other postretirement benefit costs are (includes amounts related to discontinued operations):

	Pension Benefits
	Thirteen weeks ended						Thirty-nine weeks ended
	February 25, 2018			February 26, 2017			February 25, 2018			February 26, 2017
Service cost	$	9.3		$	12.2		$	35.2		$	44.8
Interest cost	27.6			28.9			83.5			88.8
Expected return on plan assets	(54.8		)	(50.9		)	(163.6		)	(158.6		)
Amortization of prior service cost	0.7			0.7			2.1			2.0
Recognized net actuarial loss	—			—			3.4			—
Settlement charge	—			13.8			—			13.8
Special termination benefits	—			—			—			1.5
Curtailment loss	—			—			0.7			—
Benefit cost (benefit) — Company plans	(17.2		)	4.7			(38.7		)	(7.7		)
Pension benefit cost — multi-employer plans	(0.2		)	3.9			5.5			9.0
Total benefit cost (benefit)	$	(17.4	)	$	8.6		$	(33.2	)	$	1.3

	Postretirement Benefits
	Thirteen weeks ended						Thirty-nine weeks ended
	February 25, 2018			February 26, 2017			February 25, 2018			February 26, 2017
Service cost	$	—		$	—		$	—		$	0.1
Interest cost	1.0			1.1			2.8			3.2
Amortization of prior service benefit	(0.9		)	(1.6		)	(2.5		)	(4.9		)
Recognized net actuarial loss	—			0.1			—			0.3
Total cost (benefit)	$	0.1		$	(0.4	)	$	0.3		$	(1.3	)