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Retirement Benefit Plans (Tables)
 9 Months Ended
Sep. 28, 2013
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 28, 2013 and September 29, 2012 were as follows (in millions):
 
Third Quarter
 
Year-to-Date
 
Pension benefits
 
Postretirement benefits
 
Pension benefits
 
Postretirement benefits
 
2013
2012
 
2013
2012
 
2013
2012
 
2013
2012
Service cost
$
2.5

$
2.4

 
$
0.1

$
—

 
$
7.8

$
7.2

 
$
0.1

$
0.1

Interest cost
2.2

2.2

 
0.2

0.4

 
6.4

6.7

 
0.8

1.1

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

—

 
(4.3
)
(4.2
)
 
—

—

Settlement/curtailment
2.6

1.0

 
—

—

 
3.0

1.0

 
—

—

Net amortization
1.3

1.1

 
—

—

 
3.7

3.2

 
(0.2
)
—

Net periodic benefit cost
$
7.2

$
5.3

 
$
0.3

$
0.4

 
$
16.6

$
13.9

 
$
0.7

$
1.2