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Retirement Benefit Plans (Tables)
 6 Months Ended
Jun. 27, 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 second quarter and year-to-date periods ended June 27, 2015 and June 28, 2014 were as follows:
 
Second Quarter
 
Year-to-Date
 
Pension benefits
 
Post-retirement benefits
 
Pension benefits
 
Post-retirement benefits
(In millions)
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
2.7

 
$
2.8

 
$
—

 
$
0.1

 
$
5.5

 
$
5.6

 
$
—

 
$
0.1

Interest cost
1.7

 
2.2

 
0.2

 
0.2

 
3.5

 
4.4

 
0.4

 
0.6

Expected return on plan assets
(1.4
)
 
(1.5
)
 
—

 
—

 
(2.8
)
 
(3.1
)
 
—

 
—

Settlement/curtailment
0.4

 
—

 
—

 
—

 
0.4

 
—

 
—

 
—

Net amortization
1.1

 
0.6

 
(0.3
)
 
(0.1
)
 
2.1

 
1.2

 
(0.6
)
 
(0.3
)
Net periodic benefit cost
$
4.5

 
$
4.1

 
$
(0.1
)
 
$
0.2

 
$
8.7

 
$
8.1

 
$
(0.2
)
 
$
0.4