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Pension and Other Postemployment Benefits
3 Months Ended
Mar. 31, 2015
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, 2015 and 2014 were (in millions):
 
2015
 
2014
Service cost
$
1.2

 
$
1.7

Interest cost
1.7

 
1.7

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

 
1.1

Amortization of actuarial (gains) losses
1.4

 
0.5

 
$
4.7

 
$
4.3



We contributed $0.4 million and $0.2 million to our defined benefit pension plans in the three months ended March 31, 2015 and 2014, respectively.

Postemployment Arrangements

The components of net periodic benefit cost for the three months ended March 31, 2015 and 2014 were (in millions):
 
2015
 
2014
Service cost
$
1.2

 
$
1.0

Interest cost
1.1

 
1.1

Amortization of prior service cost
0.8

 
0.5

Amortization of actuarial (gains) losses
0.4

 
0.2

 
$
3.5

 
$
2.8