v3.8.0.1

Financial Instruments and Fair Value Measurements - Summary of Gains (Losses) From Change in Fair Value of Derivative Instruments Included in Other Comprehensive Income (Parenthetical) (Detail) € in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 EUR (€) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 EUR (€) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 EUR (€)
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Amount received from (paid for) on settlement of net investment hedges | $ 0 | $ 0 | $ 2,500,000 | $ 16,800,000 |  |  |  |  |
Amount received from (paid for) on settlement of net investment hedges | 0 | 0 | (2,500,000) | (16,800,000) |  |  |  |  |
Interest expense reclassified | 64,190,000 | 75,310,000 | 212,456,000 | 232,577,000 |  |  |  |  |
Debt | 9,721,065,000 |  | 9,721,065,000 |  |  |  |  | $ 10,608,294,000 |
Amount of gain (loss) included in AOCI | 4,061,000 | (48,232,000) | 46,890,000 | (69,832,000) |  |  |  |  |
Senior notes | 6,900,000,000 |  | 6,900,000,000 |  |  |  |  |  |
Forward Contracts |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Amount of gain (loss) included in AOCI | (3,800,000) | 0 | (15,100,000) |  |  |  |  |  |
Foreign Currency Options [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Amount of gain (loss) included in AOCI | 4,200,000 |  | 4,200,000 |  |  |  |  |  |
Designated As Hedging Instrument [Member] | Forward Contracts |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Debt | 3,600,000,000 |  | 3,600,000,000 |  | € 3,000.0 |  |  | $ 3,400,000,000 | € 3,200.0
Designated As Hedging Instrument [Member] | Foreign Currency Options [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Senior notes | 415,000,000 |  | 415,000,000 |  | € 322.8 | $ 645,300,000 | € 500.0 |  |
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Interest expense reclassified | 1,300,000 | $ 2,000,000 | 4,200,000 | $ 4,100,000 |  |  |  |  |
Amount to be reclassified to interest expense, next 12 months | $ 3,500,000 |  | $ 3,500,000 |  |  |  |  |  |

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