PENSION AND POSTRETIREMENT BENEFITS (Tables)

9 Months Ended

Feb. 24, 2019

Retirement Benefits [Abstract]

Components of Pension Benefit and Other Postretirement Benefit Costs

Components of pension benefit and other postretirement benefit costs are:

	Pension Benefits
	Thirteen weeks ended						Thirty-nine weeks ended
	February 24, 2019			February 25, 2018			February 24, 2019			February 25, 2018
Service cost	$	2.8		$	4.8		$	8.3		$	21.6
Interest cost	34.0			27.6			98.7			83.5
Expected return on plan assets	(44.6		)	(50.3		)	(130.1		)	(150.0		)
Amortization of prior service cost	0.7			0.7			2.1			2.1
Recognized net actuarial loss	—			—			—			3.4
Curtailment loss	—			—			—			0.7
Benefit cost (benefit) — Company plans	(7.1		)	(17.2		)	(21.0		)	(38.7		)
Pension benefit cost — multi-employer plans	1.4			(0.2		)	4.9			5.5
Total benefit cost (benefit)	$	(5.7	)	$	(17.4	)	$	(16.1	)	$	(33.2	)

	Postretirement Benefits
	Thirteen weeks ended						Thirty-nine weeks ended
	February 24, 2019			February 25, 2018			February 24, 2019			February 25, 2018
Service cost	$	—		$	—		$	0.1		$	—
Interest cost	1.0			1.0			2.9			2.8
Amortization of prior service benefit	(0.5		)	(0.9		)	(1.5		)	(2.5		)
Recognized net actuarial gain	(0.4		)	—			(1.2		)	—
Curtailment gain	—			—			(0.6		)	—
Total cost (benefit)	$	0.1		$	0.1		$	(0.3	)	$	0.3