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Financial Instruments and Risk Management - Derivative and Hedging Instruments (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 576.1 |
Fair value gain/(loss) | 10.3 | $ (9.6)
Hedge ineffectiveness | 0.0 |
Derivative assets | 12.9 | 5.9
Derivative liabilities | 2.6 | $ 15.5
Canadian dollar |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 204.8 |
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.80 |
Maximum period in months | 12 months |
Fair value gain/(loss) | $ 4.1 |
Thai baht |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 79.0 |
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.03 |
Maximum period in months | 12 months |
Fair value gain/(loss) | $ 2.2 |
Malaysian ringgit |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 48.4 |
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.23 |
Maximum period in months | 12 months |
Fair value gain/(loss) | $ 2.6 |
Mexican peso |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 29.3 |
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.05 |
Maximum period in months | 12 months |
Fair value gain/(loss) | $ (0.9) |
British pound |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 56.4 |
Weighted average exchange rate in U.S. dollars (in dollars per share) | 1.34 |
Maximum period in months | 3 months |
Fair value gain/(loss) | $ (0.5) |
Chinese renminbi |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 71.6 |
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.15 |
Maximum period in months | 12 months |
Fair value gain/(loss) | $ 1.5 |
Euro |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 28.7 |
Weighted average exchange rate in U.S. dollars (in dollars per share) | 1.19 |
Maximum period in months | 12 months |
Fair value gain/(loss) | $ 0.1 |
Romanian leu |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 28.4 |
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.25 |
Maximum period in months | 12 months |
Fair value gain/(loss) | $ 0.6 |
Singapore dollar |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 25.0 |
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.73 |
Maximum period in months | 12 months |
Fair value gain/(loss) | $ 0.6 |
Other |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | 4.5 |
Fair value gain/(loss) | $ 0.0 |

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- Definition The average price of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 23B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_23B_b&doctype=Standard -URIDate 2017-03-09 + Details
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