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DERIVATIVE INSTRUMENTS - Narrative (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Oct. 02, 2017 CHF (SFr) | Oct. 02, 2017 USD ($)
Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain recorded in AOCI, change in fair value | $ (26,847,000) | $ 1,803,000 |  |  |
Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current notional amount | 1,325,000,000 |  | $ 1,325,000,000 |  |
Cross-currency swap | Net Investment Hedges | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain reclassified into other income | 2,200,000 | 2,300,000 |  |  |
Gain expected to be reclassified to earnings in the next twelve months | 8,200,000 |  |  |  |
Gain recorded in AOCL, net investment hedge, change in fair value | 16,700,000 | 7,900,000 |  |  |
Codman | Cross-currency swap | Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (loss) recorded in other income, net | (1,700,000) | 3,300,000 |  |  |
Gain recorded in AOCI, change in fair value | 5,900,000 | 5,500,000 |  |  |
Gain reclassified into other income | 1,500,000 | $ 1,900,000 |  |  |
Gain expected to be reclassified to earnings in the next twelve months | $ 5,100,000 |  |  |  |
Codman | Cross-currency swap | Short |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current notional amount |  |  |  |  | $ 300,000,000.0
Codman | Cross-currency swap | Long |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Current notional amount | SFr |  |  |  | SFr 291,200,000 |

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