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Pension and Other Postemployment Benefits
 9 Months Ended
Sep. 30, 2014
Pension and Other Postemployment Benefits [Abstract]  
Pension and Other Postemployment Benefits
Pension and Other Postemployment Benefits
Net periodic benefit cost is included in the salary and service costs component of operating expenses.
Defined Benefit Pension Plans
The components of net periodic benefit cost for the nine months ended September 30, 2014 and 2013 were (in millions):
 
2014
 
2013
Service cost
$
5.5

 
$
3.3

Interest cost
5.5

 
4.6

Expected return on plan assets
(2.2
)
 
(2.1
)
Amortization of prior service cost
3.2

 
2.7

Amortization of actuarial (gains) losses
1.4

 
2.4

 
$
13.4

 
$
10.9

We contributed $0.7 million and $3.1 million to our defined benefit pension plans in the nine months ended September 30, 2014 and 2013, respectively.
Postemployment Arrangements
The components of net periodic benefit cost for the nine months ended September 30, 2014 and 2013 were (in millions):
 
2014
 
2013
Service cost
$
3.0

 
$
3.0

Interest cost
3.3

 
3.3

Amortization of prior service cost
1.6

 
1.5

Amortization of actuarial (gains) losses
0.6

 
1.0

 
$
8.5

 
$
8.8