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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Sep. 30, 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 subsidiaries, including the following operations as of September 30, 2017:
Name
 
Location
 
Ownership Interest
 
Operation
 
Status of Operations
Northshore
 
Minnesota
 
100.0%
 
Iron Ore
 
Active
United Taconite
 
Minnesota
 
100.0%
 
Iron Ore
 
Active
Tilden1
 
Michigan
 
100.0%
 
Iron Ore
 
Active
Empire1
 
Michigan
 
100.0%
 
Iron Ore
 
Indefinitely Idled
Koolyanobbing
 
Western Australia
 
100.0%
 
Iron Ore
 
Active
 
 
 
 
 
 
 
 
 
1 During the third quarter of 2017, our ownership interest in Tilden and Empire changed. Refer to the Noncontrolling Interests section below for additional information.
Foreign Currency Transaction [Table Text Block]
The following represents the transaction gains and losses resulting from remeasurement for the three and nine months ended September 30, 2017 and 2016:
 
 
(In Millions)
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2017
 
2016
 
2017
 
2016
Remeasurement of short-term intercompany loans
 
$
0.1

 
$
0.2

 
$
16.7

 
$
0.5

Remeasurement of cash and cash equivalents
 
(1.1
)
 
(1.1
)
 
(2.8
)
 
0.3

Other remeasurement
 
(1.4
)
 
0.6

 
(2.7
)
 
(2.0
)
Net impact of transaction gains (losses) resulting from remeasurement
 
$
(2.4
)
 
$
(0.3
)
 
$
11.2

 
$
(1.2
)
Adoption of New Standard [Table Text Block]
The following represents the estimated impact from the adoption of ASU No. 2017-07 for the nine months ended September 30, 2017:
 
 
($ in Millions)
 
 
Nine Months Ended
September 30, 2017
 
 
 
 
Estimate
Financial Statement Line Impacted
 
As Reported
 
Adoption of ASU No. 2017-07
 
As Adjusted
Cost of goods sold and operating expenses
 
$
(1,328.3
)
 
$
1.3

 
$
(1,327.0
)
Selling, general and administrative expenses
 
$
(77.8
)
 
$
(5.8
)
 
$
(83.6
)
Miscellaneous - net
 
$
3.0

 
$
(1.2
)
 
$
1.8

Operating income
 
$
326.2

 
$
(5.7
)
 
$
320.5

Other non-operating income
 
$
2.3

 
$
5.7

 
$
8.0

Net Income (Loss)
 
$
53.2

 
$
—

 
$
53.2