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Pension and Post-retirement Plans: (Tables)
 6 Months Ended
Jun. 30, 2013
Pension and Post-retirement Plans:  
Components of Net Periodic Benefit Cost

The components of net periodic benefit cost recorded for the first six months of 2013 and 2012 were as follows (in millions):

 

 

 

Pension Benefits

 

Post-retirement Benefits

 

 

 

2013

 

2012

 

2013

 

2012

 

 

 

 

 

 

 

 

 

 

 

Service cost

 

$

1.4

 

$

1.3

 

$

0.5

 

$

0.4

 

Interest cost

 

4.3

 

4.5

 

1.1

 

1.1

 

Expected return on plan assets

 

(5.9

)

(5.3

)

—

 

—

 

Amortization of net loss

 

3.4

 

(0.7

)

0.2

 

—

 

Amortization of prior service cost

 

(1.1

)

4.3

 

—

 

0.9

 

Net periodic benefit cost

 

$

2.1

 

$

4.1

 

$

1.8

 

$

2.4