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Quarterly report pursuant to Section 13 or 15(d)

REVENUE (Narrative) (Details)

v3.10.0.1
REVENUE (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenues $ 714.3 $ 471.3 $ 894.3 $ 757.5 Ìý Ìý
Deferred revenue, current 20.0 Ìý 20.0 Ìý Ìý $ 23.8
Deferred revenue, noncurrent 47.1 Ìý 47.1 Ìý Ìý 51.4
Other current liabilities 66.2 Ìý 66.2 Ìý $ 68.8 67.4
Customer Supplemental Payments [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Deferred revenue 59.9 Ìý 59.9 Ìý Ìý 64.2
Deferred revenue, current 12.8 Ìý 12.8 Ìý Ìý 12.8
Take or Pay Contracts [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Deferred revenue 7.2 Ìý 7.2 Ìý Ìý $ 9.6
U.S. Iron Ore [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Revenues 714.3 471.3 894.3 757.5 Ìý Ìý
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Revenues 110.0 Ìý 47.5 Ìý Ìý Ìý
Other current liabilities 5.9 Ìý 5.9 Ìý $ 1.4 Ìý
Not Designated as Hedging Instrument [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 154.7 $ 30.8 $ 198.5 $ 63.0 Ìý Ìý