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EMPLOYEE BENEFIT PLANS (Tables)
 4 Months Ended
Jun. 20, 2020
Retirement Benefits [Abstract]  
Schedule of Components of Net Pension and Post-retirement Expense
The following tables provide the components of net pension and post-retirement (income) expense (in millions):
 
16 weeks ended
 
Pension
 
Other post-retirement benefits
 
June 20,
2020
 
June 15,
2019
 
June 20,
2020
 
June 15,
2019
Estimated return on plan assets
$
(31.5
)
 
$
(33.9
)
 
$
—

 
$
—

Service cost
4.8

 
4.5

 
—

 
0.2

Interest cost
16.6

 
24.8

 
0.1

 
0.2

Amortization of prior service cost
0.1

 
0.1

 
0.6

 
1.1

Amortization of net actuarial loss (gain)
0.6

 
0.2

 
(0.2
)
 
(0.1
)
(Income) expense, net
$
(9.4
)
 
$
(4.3
)
 
$
0.5

 
$
1.4