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INCOME TAXES - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |
Net deferred tax assets increase | $ (21.0) |  |  |
Valuation allowance that reduces certain deferred tax assets | 46.7 | $ 41.6 |  |
California research expenditure tax credits | 127.0 |  |  |
Tax benefit from remeasurement of deferred taxes |  | 3.3 |  |
Tax benefit from harvesting foreign tax credits |  | 32.3 |  |
Effects of mandatory deemed repatriation |  | 297.4 |  |
Gross uncertain tax positions | 150.7 | 225.6 | $ 245.5 | $ 216.1
Reduction in liabilities from offsetting tax benefits | 42.7 | 94.0 |  |
Net amounts that would favorably affect effective tax rate | 108.0 | 131.6 |  |
Accrued interest related to unrecognized tax benefits, net of tax benefit | 4.6 | 7.4 |  |
Tax benefit of accrued interest | 1.9 | 2.9 |  |
Interest expense, net of tax benefit | (2.8) | (7.3) | 4.0 |
Settlements | 46.5 | 95.3 | 0.3 |
Provision for income taxes | (39.2) | (451.3) | (168.4) |
Adjustment to transition tax | 12.8 |  |  |
Deferred tax asset provisional income tax expense (benefit) | (3.7) |  |  |
Foreign earnings to be indefinitely reinvested | 1,100.0 |  |  |
Foreign earnings to be repatriated | 600.0 |  |  |
Estimated net tax liability on permanently reinvested earnings | 12.7 |  |  |
Non-U.S. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax reductions compared to local statutory rates | $ 144.9 | $ 81.0 | $ 78.7 |
Tax reductions compared to local statutory rates per diluted share (in dollars per share) | $ 0.70 | $ 0.39 | $ 0.32 |
Research expenditure tax credits | Carryforward period indefinite | California | State and local jurisdiction |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
California research expenditure tax credits | $ 106.4 |  |  |

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