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Retirement Plans (Notes)
 9 Months Ended
Sep. 26, 2020
Retirement Benefits [Abstract]  
Retirement Plans RETIREMENT PLANS
The following is a summary of net pension and Supplemental Executive Retirement Plan (“SERP”) expense recognized by the Company.
 Quarter EndedYear-To-Date Ended
(In millions)September 26,
2020		September 28,
2019		September 26,
2020		September 28,
2019
Service cost pertaining to benefits earned during the period
$1.6 $1.3 $4.8 $4.1 
Interest cost on projected benefit obligations
3.6 3.8 10.7 11.4 
Expected return on pension assets
(4.7)(4.4)(14.0)(13.3)
Net amortization loss
1.6 0.7 4.9 2.0 
Net pension expense
$2.1 $1.4 $6.4 $4.2 
The non-service cost components of net pension expense is recorded in the Other income, net line item on the consolidated condensed statements of operations and comprehensive income.