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Retirement Benefit Plans (Tables)
 9 Months Ended
Sep. 26, 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 third quarter and year-to-date periods ended September 26, 2015 and September 27, 2014 were as follows:
 
Third 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
$
2.6

 
$
2.6

 
$
0.1

 
$
—

 
$
8.1

 
$
8.2

 
$
0.1

 
$
0.1

Interest cost
1.8

 
2.1

 
0.1

 
0.3

 
5.3

 
6.5

 
0.5

 
0.9

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

 
—

 
(4.2
)
 
(4.6
)
 
—

 
—

Settlement/curtailment
0.1

 
0.4

 
—

 
—

 
0.5

 
0.4

 
—

 
—

Net amortization
1.0

 
0.7

 
(0.3
)
 
(0.3
)
 
3.1

 
1.9

 
(0.9
)
 
(0.6
)
Net periodic benefit cost
$
4.1

 
$
4.3

 
$
(0.1
)
 
$
—

 
$
12.8

 
$
12.4

 
$
(0.3
)
 
$
0.4