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Employee Retirement Benefits (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Employee Retirement Benefits    
Components of net periodic pension and postretirement expense
 
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
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