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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)
3 Months Ended
Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule Of Subsidiaries
The unaudited condensed consolidated financial statements include our accounts and the accounts of our wholly-owned and majority-owned subsidiaries, including the following operations as of March 31, 2017:
Name
 
Location
 
Ownership Interest
 
Operation
 
Status of Operations
Northshore
 
Minnesota
 
100.0%
 
Iron Ore
 
Active
United Taconite
 
Minnesota
 
100.0%
 
Iron Ore
 
Active
Tilden
 
Michigan
 
85.0%
 
Iron Ore
 
Active
Empire
 
Michigan
 
79.0%
 
Iron Ore
 
Indefinitely Idled
Koolyanobbing
 
Western Australia
 
100.0%
 
Iron Ore
 
Active
Foreign Currency Transaction [Table Text Block]
The following represents the transaction gains and losses resulting from remeasurement for the three months ended March 31, 2017 and 2016:
 
 
(In Millions)
 
 
Three Months Ended
March 31,
 
 
2017
 
2016
Remeasurement of intercompany loans
 
$
15.1

 
$
0.4

Remeasurement of cash and cash equivalents
 
(1.2
)
 
0.8

Other remeasurement
 
(0.3
)
 
(2.4
)
Net impact of transaction gains and (losses) resulting from remeasurement
 
13.6

 
(1.2
)