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DERIVATIVE INSTRUMENTS - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Oct. 02, 2017 CHF (SFr) | Oct. 02, 2017 USD ($)
Derivative [Line Items] |  |  |  |  |  |
Derivative, notional amount matured | $ 150,000,000 |  | $ 150,000,000 |  |  |
Designated as Hedging Instrument | Cash Flow Hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Current notional amount | 1,475,000,000 |  | 1,475,000,000 |  |  |
Cross-currency swap | Codman |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain (loss), reclassification from AOCI, foreign currency rate translation, intercompany loan | (5,100,000) | $ 11,300,000 | (1,800,000) | $ 4,900,000 |  |
Gain reclassified into other income | 1,700,000 | 2,000,000.0 | 3,700,000 | 3,900,000 |  |
Pre-tax income recorded in AOCI related to cash flow hedges to be reclassified to earnings in the next twelve months | 6,800,000 |  | 6,800,000 |  |  |
Cross-currency swap | Codman | Other income, net |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain (loss) recorded to AOCI | (1,700,000) | $ 13,000,000.0 | 5,800,000 | $ 6,100,000 |  |
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 |
Cross-currency swap | Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain (loss) recorded in AOCI, change in fair value | (800,000) |  | 9,400,000 |  |  |
Cross-currency swap | Designated as Hedging Instrument | Net Investment Hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain reclassified into other income | 2,400,000 |  | 4,700,000 |  |  |
Pre-tax income recorded in AOCI related to cash flow hedges to be reclassified to earnings in the next twelve months | 9,000,000.0 |  | 9,000,000.0 |  |  |
Cross-currency swap | Designated as Hedging Instrument | Codman | Cash Flow Hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Current notional amount | $ 33,300,000 |  | 33,300,000 |  |  |
Loss recorded in other income, net |  |  | $ 400,000 |  |  |

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