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Quarterly report pursuant to Section 13 or 15(d)

REVENUE (Narrative) (Details)

v3.8.0.1
REVENUE (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenues $ 239.0 $ 461.6 Ìý Ìý
Deferred Revenue, Current 31.0 Ìý Ìý $ 23.8
Deferred Revenue, Noncurrent 51.4 Ìý Ìý 51.4
Other current liabilities 104.3 Ìý $ 87.6 86.2
Customer Supplemental Payments [Member] Ìý Ìý Ìý Ìý
Deferred Revenue 64.2 Ìý Ìý 64.2
Deferred Revenue, Current 12.8 Ìý Ìý 12.8
Deferred Revenue, Noncurrent Ìý Ìý Ìý 51.4
Take or Pay Contracts [Member] Ìý Ìý Ìý Ìý
Deferred Revenue 18.2 Ìý Ìý $ 9.6
U.S. Iron Ore [Member] Ìý Ìý Ìý Ìý
Revenues 180.0 286.2 Ìý Ìý
U.S. Iron Ore [Member] | Derivative Adjustment [Member] Ìý Ìý Ìý Ìý
Revenues 43.8 Ìý Ìý Ìý
Asia Pacific Iron Ore [Member] Ìý Ìý Ìý Ìý
Revenues 59.0 $ 175.4 Ìý Ìý
Asia Pacific Iron Ore [Member] | Derivative Adjustment [Member] Ìý Ìý Ìý Ìý
Revenues 1.3 Ìý Ìý Ìý
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Ìý Ìý Ìý Ìý
Revenues 62.5 Ìý Ìý Ìý
Other current liabilities $ 0.3 Ìý $ 1.4 Ìý