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Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Investments          
Investments $ 33.4   $ 33.4    
Long-term investments 192.8   192.8   $ 169.7
Unrealized gains losses on available-for-sale investments          
Change in the fair value of equity investments at FVTOCI 28.2 $ 11.9 54.5   (17.7)
Deferred tax (expense) recovery in other comprehensive income (3.4) (1.5) (6.8)   2.4
Change in the fair value of equity investments at FVTOCI, net of tax 24.8 $ 10.4 47.7 $ (15.3) (15.3)
Equity investments          
Investments          
Long-term investments 191.8   191.8   136.7
Warrants          
Investments          
Long-term investments 1.0   1.0   0.7
Loan receivable          
Investments          
Investments $ 33.4   $ 33.4    
Long-term investments         $ 32.3