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PENSION AND POSTRETIREMENT PLANS (Tables)
 6 Months Ended
Jun. 30, 2012
Postemployment Benefits [Abstract]  
Schedule of Pensions and Postretirement Plans
The effect on operations for the Company Plan and the PEP is summarized as follows:

 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2012
 
2011
 
2012
 
2011
Service cost for benefits earned
$
0.6

 
$
0.7

 
$
1.2

 
$
1.3

Interest cost on benefit obligation
3.7

 
4.2

 
7.4

 
8.6

Expected return on plan assets
(4.2
)
 
(4.8
)
 
(8.6
)
 
(9.3
)
Net amortization and deferral
2.9

 
2.0

 
6.0

 
3.7

Defined benefit plan costs
$
3.0

 
$
2.1

 
$
6.0

 
$
4.3

The effect on operations of the post-retirement medical plan is shown in the following table:

 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2012
 
2011
 
2012
 
2011
Service cost for benefits earned
$
0.1

 
$
0.1

 
$
0.2

 
$
0.2

Interest cost on benefit obligation
0.6

 
0.5

 
1.2

 
1.1

Net amortization and deferral
—

 
—

 
—

 
—

Postretirement medical plan costs
$
0.7

 
$
0.6

 
$
1.4

 
$
1.3