PENSION AND POSTRETIREMENT BENEFITS

We have defined benefit retirement plans ("plans") for eligible salaried and hourly employees. Benefits are based on years of credited service and average compensation or stated amounts for each year of service. We also sponsor postretirement plans which provide certain medical and dental benefits ("other postretirement benefits") to qualifying U.S. employees.

Components of pension benefit and other postretirement benefit costs are:



	Pension Benefits
	Thirteen weeks ended
	August 26, 2018			August 27, 2017
Service cost	$	2.7		$	12.7
Interest cost	32.0			28.2
Expected return on plan assets	(42.3		)	(54.2		)
Amortization of prior service cost	0.7			0.7
Benefit cost (benefit) — Company plans	(6.9		)	(12.6		)
Pension benefit cost — multi-employer plans	1.7			1.5
Total benefit cost (benefit)	$	(5.2	)	$	(11.1	)



	Postretirement Benefits
	Thirteen weeks ended
	August 26, 2018			August 27, 2017
Service cost	$	0.1		$	—
Interest cost	0.9			0.9
Amortization of prior service benefit	(0.5		)	(0.8		)
Recognized net actuarial gain	(0.4		)	—
Curtailment gain	(0.6		)	—
Total cost (benefit)	$	(0.5	)	$	0.1

The Company uses a split discount rate (spot-rate approach) for the U.S. plans and certain foreign plans. The spot-rate approach applies separate discount rates for each projected benefit payment in the calculation of pension service and interest cost.

The weighted-average discount rates for service and interest costs under the spot-rate approach used for pension benefit cost in fiscal 2019 were 4.21% and 3.83%.

During the first quarter of fiscal 2019, we contributed $4.2 million to our pension plans and contributed $2.6 million to our other postretirement plans. Based upon the current funded status of the plans and the current interest rate environment, we anticipate making further contributions of approximately $10.3 million to our pension plans for the remainder of fiscal 2019. We anticipate making further contributions of approximately $13.6 million to our other postretirement plans during the remainder of fiscal 2019. These estimates are based on ERISA guidelines, current tax laws, plan asset performance, and liability assumptions, which are subject to change.