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PENSIONS AND OTHER POSTRETIREMENT BENEFITS PENSION AND OTHER POSTRETIREMENT BENEFITS (Additional Information) (Tables)
 12 Months Ended
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Additional Information
Additional Information
 
(In Millions)
 
Pension Benefits
 
Other Benefits
 
2013
 
2012
 
2011
 
2013
 
2012
 
2011
Effect of change in mine ownership & noncontrolling interest
$
46.5

 
$
54.8

 
$
53.3

 
$
4.8

 
$
8.6

 
$
12.5

Actual return on plan assets
109.5

 
92.5

 
10.8

 
11.0

 
26.1

 
1.9