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Income Taxes - Major Components Of Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current income tax expense:      
Current year $ 44.4 $ 39.3 $ 48.3
Adjustments for prior years, including changes to net provisions related to tax uncertainties (4.7) (0.2) (34.1)
Current tax expense 39.7 39.1 [1] 14.2 [1]
Deferred income tax expense (recovery):      
Origination and reversal of temporary differences 6.2 (5.6) 20.0
Changes in previously unrecognized tax losses and deductible temporary differences, including adjustments for prior years (62.9) (5.9) (9.5)
Deferred tax expense (56.7) (11.5) [1] 10.5 [1]
Income tax expense $ (17.0) $ 27.6 [1] $ 24.7 [1]
[1] Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)