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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Fair Value Measurements [Line Items] |  |  |
Maturity period limit of foreign currency exchange instruments (in months) | 3 months |  |
Net fair value gain (loss) on foreign exchange forward contracts | $ (17.3) | $ 0.6 |
Difference between carrying amount and fair value of long-term debt | 4.0 |  | $ 3.0
Other Income (Expense), Net |  |  |
Fair Value Measurements [Line Items] |  |  |
Gain (loss) on foreign exchange forward contracts | (14.1) | 22.8 |
Prepaid Expenses and Other Current Assets |  |  |
Fair Value Measurements [Line Items] |  |  |
Net fair value gain (loss) on foreign exchange forward contracts | 1.9 | 1.3 |
Other Accrued Liabilities |  |  |
Fair Value Measurements [Line Items] |  |  |
Net fair value gain (loss) on foreign exchange forward contracts | 19.2 | 0.7 |
Foreign Exchange Contract |  |  |
Fair Value Measurements [Line Items] |  |  |
Notional amount of foreign exchange forward contracts not designated as hedging instruments | $ 473.8 | $ 408.4 |

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959 + Details
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