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Financial Risk Management (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Cumulative translation adjustment | $ 77.2 | $ 21.3
Investments | $ 203.1 | 147.4
Foreign Exchange Risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Percentage of Interest-bearing deposits in US dollars | 87.00% |
Percentage of Interest-bearing deposits in Canadian dollars | 2.00% |
Percentage of Interest-bearing deposits in other currencies | 11.00% |
Cumulative translation adjustment | $ 77.2 | $ 21.3
Interest Rate Risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Increase in interest rate used for sensitivity analysis (as a percent) | 0.50% | 0.50%
Decrease in interest rate used for sensitivity analysis (as a percent) | 0.50% | 0.50%
Interest rate sensitivities increase effect on net income | $ (2.2) | $ (1.0)
Interest rate sensitivities decrease effect on net income | 2.2 | 1.0
Interest rate sensitivities increase effect on equity | (2.2) | (1.0)
Interest rate sensitivities decrease in effect on equity | 2.2 | 1.0
Liquidity Risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Cash and cash equivalents and available-for-sale securities | $ 511.1 | 253.0
Term of financial liabilities | 1 year |
Capital Risk Management |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Cash and cash equivalents and available-for-sale securities | $ 511.1 | 253.0
Investments | 203.1 | 147.4
Liquid securities | 168.1 | 114.6
Capital Risk Management | Credit Facility |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Undrawn borrowing facilities | $ 1,000.0 | $ 1,000.0

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