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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
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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) |

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