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Retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Components of Net Periodic Benefit Cost
Components of net periodic benefit cost for the first quarters ended March 30, 2019 and March 31, 2018 were as follows:
 
First Quarter
 
Pension benefits
 
Post-retirement benefits
(In millions)
2019
 
2018
 
2019
 
2018
Service cost
$
1.9

 
$
2.6

 
$
—

 
$
—

Interest cost
1.5

 
1.4

 
0.1

 
0.1

Expected return on plan assets
(1.1
)
 
(1.1
)
 
—

 
—

Settlement/curtailment
—

 
0.1

 
—

 
—

Net amortization
—

 
—

 
(0.3
)
 
(0.3
)
Net periodic benefit cost
$
2.3

 
$
3.0

 
$
(0.2
)
 
$
(0.2
)