PENSIONS AND OTHER POSTRETIREMENT BENEFITS PENSION AND OTHER POSTRETIREMENT BENEFITS (Additional Information) (Tables)

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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