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Financial instruments and concentration of credit risks (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Fair Value of Foreign Exchange Forward Contracts by Balance Sheet Location | The following table summarizes the fair value of the company’s foreign exchange forward contracts as of December 31, 2018 and 2017.
As of December 31, |  | 2018 |  |  | 2017 |
Balance Sheet Location |  |  |  |
Prepaid expenses and other current assets |  | $ | 3.4 |  |  | $ | 4.9 |
Other accrued liabilities |  | 0.3 |  |  | 1.6 |
Total fair value |  | $ | 3.1 |  |  | $ | 3.3 |
Gains and Losses Recognized on Foreign Exchange Forward Contracts | The following table summarizes the location and amount of gains and losses recognized on foreign exchange forward contracts for the three years ended December 31, 2018.
Year Ended December 31, | 2018 |  |  | 2017 |  |  | 2016 |
Statement of Income Location |  |  |  |  |
Other income (expense), net | $ | (14.2 | ) |  | $ | 27.5 |  |  | $ | (29.1 | )

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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