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Retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 28, 2015
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 28, 2015 and March 29, 2014 were as follows:
 
First Quarter
 
Pension benefits
 
Postretirement benefits
(In millions)
2015
2014
 
2015
2014
Service cost
$
2.8

$
2.8

 
$
—

$
—

Interest cost
1.8

2.2

 
0.2

0.4

Expected return on plan assets
(1.4
)
(1.6
)
 
—

—

Net amortization
1.0

0.6

 
(0.3
)
(0.2
)
Net periodic benefit cost
$
4.2

$
4.0

 
$
(0.1
)
$
0.2