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THE COMPANY AND BASIS OF PREPARATION. (Narrative) (Details) - USD ($) $ in Millions | Jan. 01, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance | [1] |  | $ 14.5
Available-for-sale investments |  |  | 597.1
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accounting guidance |  | $ 2.3 | 0.0
ASU 2016-01, Adjustment for fair value for previous cost method investments [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase in investment carrying value |  | 19.5 |
Increase in deferred taxes |  | 5.0 |
Accumulated other comprehensive income (loss) [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance | [1] |  | (7.9)
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accounting guidance |  |  | (2.3)
Accumulated other comprehensive income (loss) [Member] | ASU 2016-01, Available for sale securities, Unrealized gain reclassification [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance |  | (7.9) |
Retained earnings [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance | [1] |  | 22.4
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accounting guidance |  |  | $ 2.3
Retained earnings [Member] | ASU 2016-01, Available for sale securities, Unrealized gain reclassification [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance |  | 7.9 |
Retained earnings [Member] | ASU 2016-01, Adjustment for fair value for previous cost method investments [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment upon adoption of new accounting guidance |  | $ 14.5 |
[1] | Includes the reclassification of $1.7 million of stranded income taxes on available-for-sale investments resulting from the U.S. tax law changes enacted on December 22, 2017, from accumulated other comprehensive income to retained earnings.

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