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Quarterly report pursuant to Section 13 or 15(d)

REVENUE (Narrative) (Details)

v3.19.1
REVENUE (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Contract with Customer, Liability, Revenue Recognized Ìý Ìý $ 51.4 Ìý
Other current liabilities $ 113.4 Ìý 125.5 Ìý
Take or Pay Contracts [Member] Ìý Ìý Ìý Ìý
Contract with Customer, Liability 5.3 Ìý 8.2 Ìý
Not Designated as Hedging Instrument [Member] Ìý Ìý Ìý Ìý
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 5.5 $ 43.8 Ìý Ìý
Other Current Liabilities [Member] Ìý Ìý Ìý Ìý
Contract with Customer, Liability 12.9 Ìý 12.9 Ìý
Other Liabilities [Member] Ìý Ìý Ìý Ìý
Contract with Customer, Liability, Noncurrent $ 38.5 $ 51.4 $ 38.5 $ 51.4