RELATED PARTIES (Tables)

6 Months Ended

Jun. 30, 2017

Related Party Transactions [Abstract]

Summary Of Other Ownership Interests

The following is a summary of the mine ownership of these iron ore mines at June 30, 2017:

Mine	Cliffs Natural Resources		ArcelorMittal		U.S. Steel Corporation
Empire	79.0	%	21.0	%	—
Tilden	85.0	%	—		15.0	%
Hibbing	23.0	%	62.3	%	14.7	%

Summary Of Related Party Transactions Table Disclosure

Product revenues from related parties were as follows:

	(In Millions)
	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Product revenues from related parties	$	227.5		$	241.6		$	336.9		$	345.0
Total product revenues	512.0			452.8			924.8			728.4
Related party product revenue as a percent of total product revenue	44.4		%	53.4		%	36.4		%	47.4		%

Summary of Balance Sheet Presentation [Table Text Block]

The following table presents the classification of related party assets and liabilities in the Statements of Unaudited Condensed Consolidated Financial Position as of June 30, 2017 and December 31, 2016:

	(In Millions)
	Balance Sheet Location	June 30, 2017		December 31, 2016
Amounts due from related parties	Accounts receivable, net	$	18.8	$	46.9
Customer supply agreements and provisional pricing agreements	Other current assets	68.0		26.8
Amounts due to related parties	Other current liabilities	15.9		8.7