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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
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 | $ 7.1 | $ (17.3) |
Senior Secured Notes due 2022 |  |  |
Fair Value Measurements [Line Items] |  |  |
Fair value of long-term debt | 481.8 |  |
Convertible Senior Notes Due 2021 |  |  |
Fair Value Measurements [Line Items] |  |  |
Fair value of long-term debt | 318.9 |  | $ 379.8
Senior Notes due 2017 |  |  |
Fair Value Measurements [Line Items] |  |  |
Fair value of long-term debt |  |  | $ 97.8
Other Income (Expense), Net |  |  |
Fair Value Measurements [Line Items] |  |  |
Gain (loss) on foreign exchange forward contracts | 21.5 | (14.1) |
Prepaid Expenses and Other Current Assets |  |  |
Fair Value Measurements [Line Items] |  |  |
Net fair value gain (loss) on foreign exchange forward contracts | 8.6 | 1.9 |
Other Accrued Liabilities |  |  |
Fair Value Measurements [Line Items] |  |  |
Net fair value gain (loss) on foreign exchange forward contracts | (1.5) | (19.2) |
Foreign Exchange Contract |  |  |
Fair Value Measurements [Line Items] |  |  |
Notional amount of foreign exchange forward contracts not designated as hedging instruments | $ 408.0 | $ 473.8 |

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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=64837297&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=64837297&loc=SL5580258-113959 + Details
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- Definition Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959 + Details
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