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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)    
Income tax expense (recovery), equity investments $ 0.3 $ (0.3)
Income tax expense (recovery), cash flow hedges - effective portion 4.5 (20.9)
Income tax expense, cash flow hedges- reclassed to profit or loss $ 3.2 $ 0.2