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

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

 

 

 

Pension Benefits

 

Post-retirement Benefits

 

 

 

2013

 

2012

 

2013

 

2012

 

 

 

 

 

 

 

 

 

 

 

Service cost

 

$

2.1

 

$

2.0

 

$

0.8

 

$

0.7

 

Interest cost

 

6.5

 

6.8

 

1.6

 

1.7

 

Expected return on plan assets

 

(8.9

)

(8.0

)

—

 

—

 

Amortization of net loss

 

5.1

 

6.0

 

0.2

 

1.0

 

Amortization of prior service cost

 

(1.7

)

(1.3

)

—

 

—

 

Net periodic benefit cost

 

$

3.1

 

$

5.5

 

$

2.6

 

$

3.4