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Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 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
September 30, 2017
 
12 Weeks Ended
September 10, 2016
 
39 Weeks Ended
September 30, 2017
 
36 Weeks Ended
September 10, 2016
Service cost pertaining to benefits earned during the period
$
1.8

 
$
1.5

 
$
5.4

 
$
4.5

Interest cost on projected benefit obligations
4.5

 
4.5

 
13.3

 
13.3

Expected return on pension assets
(5.0
)
 
(4.6
)
 
(14.8
)
 
(13.9
)
Net amortization loss
2.4

 
1.1

 
7.3

 
3.4

Net pension expense
$
3.7

 
$
2.5

 
$
11.2

 
$
7.3