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Employee Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic pension and postretirement expense
The following table sets forth the net periodic pension and postretirement (including health care, life insurance and auto) expense (in millions of dollars):
 
Pension Benefits
 
Postretirement
Benefits (U.S.)
 
U.S.
 
Non-U.S.
 
 
Three Months Ended March 31,
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Components of Net Periodic
 
 
 
 
 
 
 
 
 
 
 
Benefit Cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
7.3

 
$
6.3

 
$
0.6

 
$
0.3

 
$
0.1

 
$
0.1

Interest cost
6.7

 
6.5

 
2.3

 
2.3

 
0.2

 
0.2

Expected return on plan assets
(7.5
)
 
(7.3
)
 
(3.1
)
 
(3.0
)
 
—

 
—

Net amortizations
4.3

 
2.8

 
0.1

 
—

 
—

 
—

Net pension /
 
 
 
 
 
 
 
 
 
 
 
postretirement expense
$
10.8

 
$
8.3

 
$
(0.1
)
 
$
(0.4
)
 
$
0.3

 
$
0.3