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PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of net periodic benefit cost
The net periodic benefit cost of the Company’s defined benefit pension and post-employment benefit plans includes: 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
Pension Benefits
 
Other Benefits
 
Pension Benefits
 
Other Benefits
(In millions)
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost – benefits earned during the period
 
$
0.6

 
$
0.8

 
$
0.3

 
$
0.2

 
$
2.1

 
$
3.6

 
$
0.9

 
$
0.6

Interest cost on projected benefit obligations
 
2.6

 
3.6

 
0.5

 
0.4

 
10.0

 
11.2

 
1.5

 
1.2

Amortization of transition cost
 
—

 
—

 
—

 
—

 
—

 
0.2

 
—

 
—

Expected return on plan assets
 
(3.4
)
 
(3.8
)
 
—

 
—

 
(10.3
)
 
(11.6
)
 
—

 
—

  Net periodic benefit cost
 
$
(0.2
)
 
$
0.6

 
$
0.8

 
$
0.6

 
$
1.8

 
$
3.4

 
$
2.4

 
$
1.8

Curtailments
 
—

 
(5.4
)
 
—

 
—

 
—

 
(5.4
)
 
—

 
—

Net Actuarial (Gains)/Losses
 
11.4

 
9.3

 
—

 
—

 
9.9

 
16.4

 
—

 
—

Total net periodic expense/(benefit)
 
$
11.2

 
$
4.5

 
$
0.8

 
$
0.6

 
$
11.7

 
$
14.4

 
$
2.4

 
$
1.8