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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, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 544.2 | $ 576.1
Fair value gain/(loss) | (14.2) | 10.3
Hedge ineffectiveness | 0.0 |
Derivative assets | 2.1 | 12.9
Derivative liabilities | 16.3 | 2.6
Canadian dollar |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 210.2 | $ 204.8
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.76 | 0.80
Maximum period in months | 12 months | 12 months
Fair value gain/(loss) | $ (10.3) | $ 4.1
Thai baht |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 81.1 | $ 79.0
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.03 | 0.03
Maximum period in months | 12 months | 12 months
Fair value gain/(loss) | $ (0.7) | $ 2.2
Malaysian ringgit |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 53.4 | $ 48.4
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.24 | 0.23
Maximum period in months | 12 months | 12 months
Fair value gain/(loss) | $ (0.8) | $ 2.6
Mexican peso |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 25.6 | $ 29.3
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.05 | 0.05
Maximum period in months | 12 months | 12 months
Fair value gain/(loss) | $ 0.2 | $ (0.9)
British pound |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 5.3 | $ 56.4
Weighted average exchange rate in U.S. dollars (in dollars per share) | 1.27 | 1.34
Maximum period in months | 4 months | 3 months
Fair value gain/(loss) | $ 0.0 | $ (0.5)
Chinese renminbi |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 66.8 | $ 71.6
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.15 | 0.15
Maximum period in months | 12 months | 12 months
Fair value gain/(loss) | $ (1.6) | $ 1.5
Euro |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 35.8 | $ 28.7
Weighted average exchange rate in U.S. dollars (in dollars per share) | 1.17 | 1.19
Maximum period in months | 12 months | 12 months
Fair value gain/(loss) | $ 0.3 | $ 0.1
Romanian leu |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 40.4 | $ 28.4
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.25 | 0.25
Maximum period in months | 12 months | 12 months
Fair value gain/(loss) | $ (0.9) | $ 0.6
Singapore dollar |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 22.1 | $ 25.0
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.74 | 0.73
Maximum period in months | 12 months | 12 months
Fair value gain/(loss) | $ (0.3) | $ 0.6
Other |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Contract amount of U.S. dollars | $ 3.5 | 4.5
Weighted average exchange rate in U.S. dollars (in dollars per share) | 0.01 |
Maximum period in months | 1 month |
Fair value gain/(loss) | $ (0.1) | $ 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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- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_a_i&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_b_ii&doctype=Standard -URIDate 2017-03-09 + Details
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