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Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Investments          
Investments $ 197.7   $ 197.7   $ 203.1
Unrealized gains losses on available-for-sale investments          
Change in the fair value of equity investments 15.6 $ 20.4 (2.1) $ 8.5  
Deferred tax recovery (expense) in other comprehensive income (2.0) (2.7) 0.4 (1.1)  
Change in the fair value of equity investments, net of tax 13.6 $ 17.7 (1.7) $ 7.4  
Equity investments          
Investments          
Investments 165.2   165.2   172.2
Warrants          
Investments          
Investments 0.8   0.8   0.8
Loan receivable          
Investments          
Investments $ 31.7   $ 31.7   $ 30.1