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Pension and Other Postemployment Benefits
 9 Months Ended
Sep. 30, 2013
Pension and Other Postemployment Benefits [Abstract]  
Pension and Other Postemployment Benefits
Pension and Other Postemployment Benefits
Defined Benefit Pension Plans
The components of net periodic benefit cost for the nine months ended September 30, 2013 and 2012 were (in millions):
 
2013
 
2012
 
 
 
 
 
 
 
 
Service cost
$
3.3

 
$
4.6

Interest cost
4.6

 
4.6

Expected return on plan assets
(2.1
)
 
(1.9
)
Amortization of prior service cost
2.7

 
2.4

Amortization of actuarial (gains) losses
2.4

 
1.1

 
 
 
 
 
 
 
 
 
$
10.9

 
$
10.8

 
 
 
 
We contributed $3.1 million and $5.3 million to our defined benefit pension plans in the nine months ended September 30, 2013 and 2012, respectively.
Postemployment Arrangements
The components of net periodic benefit cost for the nine months ended September 30, 2013 and 2012 were (in millions):
 
2013
 
2012
 
 
 
 
 
 
 
 
Service cost
$
3.0

 
$
3.0

Interest cost
3.3

 
3.5

Amortization of prior service cost
1.5

 
1.5

Amortization of actuarial (gains) losses
1.0

 
0.6

 
 
 
 
 
 
 
 
 
$
8.8

 
$
8.6

 
 
 
 

Net periodic benefit cost for our defined benefit pension plans and postemployment arrangements is included in the salary and service costs component of operating expenses.