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Employee Retirement Benefits (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Employee Retirement Benefits    
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 June 30,
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Components of Net Periodic
 
 
 
 
 
 
 
 
 
 
 
Benefit Cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
7.1

 
$
7.0

 
$
0.7

 
$
0.3

 
$
—

 
$
0.1

Interest cost
6.9

 
7.4

 
2.3

 
2.3

 
0.1

 
0.2

Expected return on plan assets
(7.5
)
 
(8.0
)
 
(3.2
)
 
(3.0
)
 
—

 
—

Net amortizations
4.0

 
3.2

 
0.1

 
(0.1
)
 
0.1

 
—

Net pension /
 
 
 
 
 
 
 
 
 
 
 
postretirement expense
$
10.5

 
$
9.6

 
$
(0.1
)
 
$
(0.5
)
 
$
0.2

 
$
0.3

 
Pension Benefits
 
Postretirement
Benefits (U.S.)
 
U.S.
 
Non-U.S.
 
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Components of Net Periodic
 
 
 
 
 
 
 
 
 
 
 
Benefit Cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
14.4

 
$
13.3

 
$
1.3

 
$
0.6

 
$
0.1

 
$
0.2

Interest cost
13.6

 
13.9

 
4.6

 
4.6

 
0.3

 
0.4

Expected return on plan assets
(15.0
)
 
(15.3
)
 
(6.3
)
 
(6.0
)
 
—

 
—

Net amortizations
8.3

 
6.0

 
0.2

 
(0.1
)
 
0.1

 
—

Net pension /
 
 
 
 
 
 
 
 
 
 
 
postretirement expense
$
21.3

 
$
17.9

 
$
(0.2
)
 
$
(0.9
)
 
$
0.5

 
$
0.6
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.
 
 
Years Ended December 31,
 
2012
 
2011
 
2010
 
2012
 
2011
 
2010
 
2012
 
2011
 
2010
Components of Net Periodic Benefit Cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
24.8

 
$
26.2

 
$
24.0

 
$
1.9

 
$
4.0

 
$
5.2

 
$
0.2

 
$
0.2

 
$
0.3

Interest cost
28.2

 
27.5

 
26.1

 
9.7

 
11.0

 
9.7

 
0.8

 
0.9

 
0.9

Expected return on plan assets
(31.5
)
 
(30.5
)
 
(26.6
)
 
(12.1
)
 
(12.8
)
 
(10.0
)
 
—

 
—

 
—

Net amortizations
11.8

 
7.2

 
4.6

 
(0.1
)
 
(0.7
)
 
(1.0
)
 
—

 
0.1

 
—

Settlement loss
2.0

 
2.2

 
0.4

 
—

 
—

 
—

 
—

 
—

 
—

Curtailment gain
—

 
—

 
—

 
—

 
(12.9
)
 
(0.2
)
 
—

 
—

 
—

Special termination cost
—

 
—

 
—

 
—

 
0.1

 
—

 
—

 
—

 
—

Net pension and postretirement expense
$
35.3

 
$
32.6

 
$
28.5

 
$
(0.6
)
 
$
(11.3
)
 
$
3.7

 
$
1.0

 
$
1.2

 
$
1.2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted‑average discount rate for expense (January 1)
4.71
%
 
5.12
%
 
5.42
%
 
4.78
%
 
5.36
%
 
5.71
%
 
4.4
%
 
4.9
%
 
5.4
%
Weighted‑average assumed long-term rate of return on assets (January 1)
8.00
%
 
8.40
%
 
8.50
%
 
7.44
%
 
7.46
%
 
7.46
%
 
N/A

 
N/A

 
N/A

Initial health care cost trend rate
N/A

 
N/A

 
N/A

 
N/A

 
N/A

 
N/A

 
8.1
%
 
8.4
%
 
8.7
%
Ultimate health care cost trend rate
N/A

 
N/A

 
N/A

 
N/A

 
N/A

 
N/A

 
4.5
%
 
4.5
%
 
4.5
%
Number of years to ultimate trend rate
N/A

 
N/A

 
N/A

 
N/A

 
N/A

 
N/A

 
17

 
18

 
19