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Retirement Benefit Plans (Tables)
6 Months Ended
Jun. 27, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Components of Net Periodic Benefit Cost
Components of net periodic benefit cost for the second quarters ended June 27, 2020 and June 29, 2019 were as follows:
Second QuarterYear-to-Date
 Pension benefitsPost-retirement benefitsPension benefitsPost-retirement benefits
(In millions)20202019202020192020201920202019
Service cost$2.1  $1.9  $—  $0.1  $4.2  $3.8  $—  $0.1  
Interest cost1.1  1.5  0.1  0.2  2.2  3.0  0.2  0.3  
Expected return on plan assets(1.0) (1.1) —  —  (2.0) (2.2) —  —  
Settlement/curtailment0.4  (0.1) —  —  0.4  (0.1) —  —  
Net amortization0.7  —  (0.3) (0.3) 1.4  —  (0.6) (0.6) 
Net periodic benefit cost$3.3  $2.2  $(0.2) $—  $6.2  $4.5  $(0.4) $(0.2)