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Retirement Plans (Tables)
 6 Months Ended
Jul. 01, 2017
Compensation and Retirement Disclosure [Abstract]  
Summary of Net Pension and SERP Expense Recognized
The following is a summary of net pension and Supplemental Executive Retirement Plan (“SERP”) expense recognized by the Company.
(In millions)
13 Weeks Ended
July 1, 2017
 
12 Weeks Ended
June 18, 2016
 
26 Weeks Ended
July 1, 2017
 
24 Weeks Ended
June 18, 2016
Service cost pertaining to benefits earned during the period
$
1.8

 
$
1.5

 
$
3.6

 
$
3.0

Interest cost on projected benefit obligations
4.4

 
4.4

 
8.8

 
8.8

Expected return on pension assets
(4.9
)
 
(4.7
)
 
(9.8
)
 
(9.3
)
Net amortization loss
2.5

 
1.2

 
4.9

 
2.3

Net pension expense
$
3.8

 
$
2.4

 
$
7.5

 
$
4.8