RECENT ACCOUNTING PRONOUNCEMENTS Adoption of ASU 2016-02: Opening Balance Sheet Cumulative Effect Adjustments (Details) - Accounting Standards Update 2016-02 [Member] - USD ($) $ in Millions	Jan. 01, 2019	Dec. 31, 2018
Other Noncurrent Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of December 31, 2017 - Prior to Adoption of ASU 2014-09		$ 196.8
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 80.0
Balance as of January 1, 2018 - Subsequent to Adoption of ASU 2014-09	276.8
Accrued Liabilities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of December 31, 2017 - Prior to Adoption of ASU 2014-09		(416.7)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(18.7)
Balance as of January 1, 2018 - Subsequent to Adoption of ASU 2014-09	(435.4)
Other Noncurrent Liabilities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance as of December 31, 2017 - Prior to Adoption of ASU 2014-09		$ (166.5)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(61.3)
Balance as of January 1, 2018 - Subsequent to Adoption of ASU 2014-09	$ (227.8)