SUBSEQUENT EVENTS (Narrative) (Details) $ / shares in Units, $ in Millions				9 Months Ended
	Oct. 18, 2018 $ / shares	Oct. 05, 2018 USD ($)	Oct. 01, 2018 employee	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Subsequent Event [Line Items]
Payments for Repurchase of Senior Notes Debt				$ 16.3	$ 1,720.7
Subsequent Event [Member]
Subsequent Event [Line Items]
Extinguishment of Debt, Amount		$ 211.0
Payments for Repurchase of Senior Notes Debt		$ 218.0
Labor agreement, contract term			4 years
Labor agreement, number of employees | employee			1,800
Common stock, dividends declared (in dollars per share) | $ / shares	$ 0.05