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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)    
Income tax expense (recovery) relating to changes in fair value of equity investments $ (0.3) $ 0.3
Income tax expense (recovery) relating to cash flow hedges - effective portion of changes in fair value (20.9) 4.8
Income tax expense (recovery) relating to cash flow hedges - reclassified to profit or loss $ 0.2 $ (5.9)