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PENSION AND OTHER POST RETIREMENT BENEFIT PLANS (Tables)
9 Months Ended
Sep. 30, 2012
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of net periodic benefit cost
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
Pension Benefits
 
Other Benefits
 
Pension Benefits
 
Other Benefits
(In millions)
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost – benefits earned during the period
 
$
1.0

 
$
0.8

 
$
0.2

 
$
0.2

 
$
2.9

 
$
2.5

 
$
0.7

 
$
0.6

Interest cost on projected benefit obligations
 
3.8

 
4.2

 
0.4

 
0.3

 
11.7

 
12.7

 
1.0

 
1.0

Expected return on plan assets
 
(4.2
)
 
(4.2
)
 

 

 
(12.1
)
 
(13.3
)
 

 

Amortization of net actuarial loss
 
1.4

 
0.7

 
0.4

 
0.4

 
4.0

 
2.3

 
1.4

 
1.3

Amortization of prior service benefit
 

 

 

 

 

 

 
(0.1
)
 
(0.1
)
Net periodic benefit cost
 
$
2.0

 
$
1.5

 
$
1.0

 
$
0.9

 
$
6.5

 
$
4.2

 
$
3.0

 
$
2.8

Settlements
 
4.1

 

 

 

 
13.1

 
0.1

 

 

Total net periodic benefit cost
 
$
6.1

 
$
1.5

 
$
1.0

 
$
0.9

 
$
19.6

 
$
4.3

 
$
3.0

 
$
2.8