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Pension and Other Postemployment Benefits
3 Months Ended
Mar. 31, 2014
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 three months ended March 31, 2014 and 2013 were (in millions):
 
2014
 
2013
 
 
 
 
Service cost
$
1.7

 
$
1.2

Interest cost
1.7

 
1.5

Expected return on plan assets
(0.7
)
 
(0.7
)
Amortization of prior service cost
1.1

 
0.9

Amortization of actuarial (gains) losses
0.5

 
1.1

 
$
4.3

 
$
4.0


We contributed $0.2 million and $1.2 million to our defined benefit pension plans in the three months ended March 31, 2014 and 2013, respectively.
Postemployment Arrangements
The components of net periodic benefit cost for the three months ended March 31, 2014 and 2013 were (in millions):
 
2014
 
2013
 
 
 
 
Service cost
$
1.0

 
$
1.1

Interest cost
1.1

 
1.0

Amortization of prior service cost
0.5

 
0.5

Amortization of actuarial (gains) losses
0.2

 
0.5

 
$
2.8

 
$
3.1


Net periodic benefit cost is included in the salary and service costs component of operating expenses.