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Quarterly report pursuant to Section 13 or 15(d)

SEGMENT REPORTING Segment Reporting (Summary of Assets by Segment) (Details)

v3.8.0.1
SEGMENT REPORTING Segment Reporting (Summary of Assets by Segment) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items] Ìý Ìý
Assets $ 1,923.3 $ 1,923.9
U.S. Iron Ore [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Assets 1,467.2 1,372.5
Asia Pacific Iron Ore [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Assets 139.4 155.1
Total Segment Assets [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Assets 1,606.6 1,527.6
Corporate [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Assets $ 316.7 $ 396.3