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Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Investments          
Investments $ 178.9   $ 178.9   $ 203.1
Unrealized gains losses on available-for-sale investments          
Change in the fair value of equity investments 11.9 $ (13.6) (17.7) $ (11.9)  
Deferred tax recovery (expense) in other comprehensive income (1.5) 1.8 2.4 1.6  
Change in the fair value of equity investments, net of tax 10.4 $ (11.8) (15.3) $ (10.3)  
Equity investments          
Investments          
Investments 146.9   146.9   172.2
Warrants          
Investments          
Investments 0.8   0.8   0.8
Loan receivable          
Investments          
Investments $ 31.2   $ 31.2   $ 30.1