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Investments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments | $ 169.4 |  | $ 203.1
Unrealized gains losses on available-for-sale investments |  |  |
Change in the fair value of equity investments | (29.6) | $ 1.7 |
Deferred tax recovery (expense) in other comprehensive income | 3.9 | (0.2) |
Change in the fair value of equity investments, net of tax | (25.7) | $ 1.5 |
Equity investments |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments | 138.0 |  | 172.2
Warrants |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments | 0.8 |  | 0.8
Loan receivable |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments | $ 30.6 |  | $ 30.1

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