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Retirement Plans (Tables)
 6 Months Ended
Jun. 18, 2016
Compensation and Retirement Disclosure [Abstract]  
Summary of Net Pension and SERP Expense Recognized
summary of net pension and Supplemental Executive Retirement Plan expense recognized by the Company.
 
12 Weeks Ended
 
24 Weeks Ended
(In millions)
June 18,
2016
 
June 20,
2015
 
June 18,
2016
 
June 20,
2015
Service cost pertaining to benefits earned during the period
$
1.5

 
$
2.1

 
$
3.0

 
$
4.2

Interest cost on projected benefit obligations
4.4

 
4.3

 
8.8

 
8.5

Expected return on pension assets
(4.7
)
 
(4.8
)
 
(9.3
)
 
(9.5
)
Net amortization loss
1.2

 
4.9

 
2.3

 
9.7

Net pension expense
$
2.4

 
$
6.5

 
$
4.8

 
$
12.9