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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Deferred revenue, current $ 16.1 Ìý $ 16.1 Ìý Ìý $ 23.8
Deferred revenue, noncurrent 42.8 Ìý 42.8 Ìý Ìý 51.4
Other current liabilities 61.3 Ìý 61.3 Ìý $ 68.8 67.4
Customer Supplemental Payments [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Deferred revenue 55.6 Ìý 55.6 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 3.3 Ìý 3.3 Ìý Ìý $ 9.6
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Other current liabilities 0.2 Ìý 0.2 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 $ 135.9 $ 38.6 $ 334.4 $ 101.6 Ìý Ìý