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DERIVATIVE INSTRUMENTS - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Oct. 02, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 02, 2017 CHF (SFr) | Oct. 02, 2017 USD ($)
Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Gain (loss) recorded in AOCL, change in fair value | $ (21,497,000) | $ 13,009,000 | $ (63,194,000) | $ (12,865,000) |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Current notional amount | 1,175,000,000 |  | 1,175,000,000 |  |  | $ 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 | 2,500,000 | 6,600,000 | 7,200,000 |  |  |  |
Gain expected to be reclassified to earnings in the next twelve months | 7,700,000 |  | 7,700,000 |  |  |  |  |
Gain (loss) recorded, net investment hedge, change in fair value | (11,300,000) | 17,100,000 | 5,100,000 | 26,600,000 |  |  |  |
Cross-currency swap | Codman | Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Gain (loss) recorded in other income, net | (6,900,000) | 5,700,000 | (12,000,000.0) | 3,900,000 |  |  |  |
Gain (loss) recorded in AOCL, change in fair value | (6,300,000) | 9,700,000 | 2,700,000 | 15,400,000 |  |  |  |
Gain reclassified into other income | 1,500,000 | $ 1,800,000 | 4,500,000 | $ 5,500,000 |  |  |  |
Gain expected to be reclassified to earnings in the next twelve months | $ 3,000,000.0 |  | $ 3,000,000.0 |  |  |  |  |
Cross-currency swap | Codman | Cash Flow Hedges | Subsequent Event | Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Current notional amount |  |  |  |  | $ 33,300,000 |  |  |
Cross-currency swap | Short | Codman |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Current notional amount |  |  |  |  |  |  |  | $ 300,000,000.0
Cross-currency swap | Long | Codman |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Current notional amount | SFr |  |  |  |  |  |  | SFr 291,200,000 |

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