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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accumulated other comprehensive income (loss)    
Balance, beginning of period $ (98.5) $ 21.1
Adjustment of initial application of IFRS 9   (56.3)
Other comprehensive loss before tax 86.1 (103.8)
Tax (8.0) 21.0
Losses on cash flow hedges transferred to cost of non-financial assets   19.5
Balance, end of period (20.4) (98.5)
Income tax expense (recovery), cash flow hedges - effective portion 4.5 (20.9)
Accumulated other comprehensive income (loss)    
Accumulated other comprehensive income (loss)    
Adjustment of initial application of IFRS 9 0.0 (56.3)
Long-term Investments    
Accumulated other comprehensive income (loss)    
Balance, beginning of period (75.2) 6.9
Adjustment of initial application of IFRS 9   (56.3)
Other comprehensive loss before tax 49.3 (26.1)
Tax (0.3) 0.3
Balance, end of period (26.2) (75.2)
Derivative Contracts    
Accumulated other comprehensive income (loss)    
Balance, beginning of period (23.3) 14.2
Other comprehensive loss before tax 36.8 (77.7)
Tax (7.7) 20.7
Losses on cash flow hedges transferred to cost of non-financial assets   19.5
Balance, end of period 5.8 $ (23.3)
Income tax expense (recovery), cash flow hedges - effective portion $ (10.0)