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Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Investments    
Investments $ 169.7 $ 203.1
Unrealized gains losses on available-for-sale investments    
Change in the fair value of equity investments (21.4) 44.5
Deferred tax recovery (expense) in other comprehensive income 3.0 (6.1)
Change in the fair value of equity investments, net of tax (18.4) 38.4
Reclassification for realized change in market value recognized in net income, net of tax   2.4
Change in market value of available-for-sale investments (18.4) 40.8
Equity investments    
Investments    
Investments 136.7 172.2
Warrants    
Investments    
Investments 0.7 0.8
Loan receivable    
Investments    
Investments $ 32.3 $ 30.1