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Pension and Post-retirement Plans: (Tables)
 9 Months Ended
Sep. 30, 2012
Pension and Post-retirement Plans:  
Components of Net Periodic Benefit Cost

 

 

Pension Benefits

 

Post-retirement Benefits

 

 

 

2012

 

2011

 

2012

 

2011

 

 

 

 

 

 

 

 

 

 

 

Service cost

 

$

2.0

 

$

4.1

 

$

0.7

 

$

0.7

 

Interest cost

 

6.8

 

8.1

 

1.7

 

2.2

 

Expected return on plan assets

 

(8.0

)

(8.4

)

—

 

—

 

Amortization of net (gain) loss

 

6.0

 

2.9

 

1.0

 

1.5

 

Amortization of prior service cost

 

(1.3

)

—

 

—

 

0.1

 

Net periodic benefit cost

 

$

5.5

 

$

6.7

 

$

3.4

 

$

4.5