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Financial Instruments and Risk Management - Foreign Currency Sensitivity Analysis (Details) - Currency risk $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Reasonably possible change in risk variable, percentage | 1.00%
Canadian dollar |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Reasonably possible increase in risk variable, impact on net earnings | $ (0.1)
Reasonably possible increase in risk variable, impact on other comprehensive income | 1.2
Reasonably possible decrease in risk variable, impact on net earnings | 0.1
Reasonably possible decrease in risk variable, impact on other comprehensive income | (1.2)
British pound sterling |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Reasonably possible increase in risk variable, impact on net earnings | 0.0
Reasonably possible increase in risk variable, impact on other comprehensive income | 0.0
Reasonably possible decrease in risk variable, impact on net earnings | 0.0
Reasonably possible decrease in risk variable, impact on other comprehensive income | 0.0
Euro |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Reasonably possible increase in risk variable, impact on net earnings | 0.0
Reasonably possible increase in risk variable, impact on other comprehensive income | 0.1
Reasonably possible decrease in risk variable, impact on net earnings | 0.0
Reasonably possible decrease in risk variable, impact on other comprehensive income | (0.1)
Thai baht |
Disclosure of nature and extent of risks arising from financial instruments [line items] |
Reasonably possible increase in risk variable, impact on net earnings | (0.1)
Reasonably possible increase in risk variable, impact on other comprehensive income | 0.7
Reasonably possible decrease in risk variable, impact on net earnings | 0.1
Reasonably possible decrease in risk variable, impact on other comprehensive income | $ (0.7)

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