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COMPREHENSIVE INCOME (LOSS) - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |  |
Cumulative foreign currency translation adjustment gain (loss) | $ 4,645.4 | $ 4,690.2 | $ 5,094.9 | $ 5,182.9 | $ 5,109.5 | $ 5,133.0
Foreign Currency Translation Gain (Loss) |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Foreign currency tax adjustment | 172.0 |  | 173.0 |  |  |
Cumulative foreign currency translation adjustment gain (loss) | (413.5) |  | (368.3) | $ (302.3) |  | $ (284.7)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest, Translation Gain (Loss) |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cumulative foreign currency translation adjustment gain (loss) | (299.7) |  | (260.2) |  |  |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest, Net Investment Hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cumulative foreign currency translation adjustment gain (loss) | $ (113.8) |  | $ (108.1) |  |  |

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