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PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2014
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)
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost – benefits earned during the period
 
$
0.8

 
$
1.3

 
$
0.2

 
$
0.3

 
$
3.6

 
$
3.9

 
$
0.6

 
$
0.8

Interest cost on projected benefit obligations
 
3.6

 
3.6

 
0.4

 
0.4

 
11.2

 
10.8

 
1.2

 
1.0

Amortization of transition cost
 
—

 
—

 
—

 
—

 
0.2

 
—

 
—

 
—

Expected return on plan assets
 
(3.8
)
 
(4.3
)
 
—

 
—

 
(11.6
)
 
(12.8
)
 
—

 
—

Amortization of prior service benefit
 
—

 
—

 
—

 
(0.1
)
 
—

 
—

 
—

 
(0.1
)
  Net periodic benefit cost
 
$
0.6

 
$
0.6

 
$
0.6

 
$
0.6

 
$
3.4

 
$
1.9

 
$
1.8

 
$
1.7

Curtailments
 
(5.4
)
 
—

 
—

 
—

 
(5.4
)
 
—

 
—

 
—

Net Actuarial (Gains)/Losses
 
9.3

 
(7.3
)
 
—

 
—

 
16.4

 
(27.2
)
 
—

 
—

Total net periodic benefit cost
 
$
4.5

 
$
(6.7
)
 
$
0.6

 
$
0.6

 
$
14.4

 
$
(25.3
)
 
$
1.8

 
$
1.7