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Financial Instruments and Risk Management - Interest Rate Risk (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Reasonably possible change in risk variable, percentage | 1.00% |
Reasonably possible change in risk variable, impact on interest expense | $ 1.9 |
Credit Facility |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings | $ 187.5 | $ 227.5

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