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PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of net periodic benefit cost
 
 
Three Months Ended June 30,
 
Six Months Ended June 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
 
$
0.7

 
$
1.5

 
$
0.3

 
$
0.2

 
$
1.5

 
$
2.8

 
$
0.6

 
$
0.4

Interest cost on projected benefit obligations
 
3.7

 
3.6

 
0.5

 
0.4

 
7.4

 
7.6

 
1.0

 
0.8

Amortization of transition cost
 
—

 
0.1

 
—

 
—

 
—

 
0.2

 
—

 
—

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

 
—

 
(6.9
)
 
(7.8
)
 
—

 
—

  Net periodic benefit cost
 
$
1.0

 
$
1.4

 
$
0.8

 
$
0.6

 
$
2.0

 
$
2.8

 
$
1.6

 
$
1.2

Net Actuarial (Gains)/Losses
 
(1.5
)
 
7.1

 
—

 
—

 
(1.5
)
 
7.1

 
—

 
—

Total net periodic expense/(benefit)
 
$
(0.5
)
 
$
8.5

 
$
0.8

 
$
0.6

 
$
0.5

 
$
9.9

 
$
1.6

 
$
1.2