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Income Taxes - Major Components Of Tax Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current income tax expense:      
Current year $ 35.1 $ 44.4 $ 39.3
Adjustments for prior years, including changes to net provisions related to tax uncertainties (12.3) (4.7) (0.2)
Current tax expense 22.8 39.7 39.1
Deferred income tax expense (recovery):      
Origination and reversal of temporary differences 15.4 6.2 (5.6)
Changes in previously unrecognized tax losses and deductible temporary differences, including adjustments for prior years (8.7) (62.9) (5.9)
Deferred tax expense 6.7 (56.7) (11.5)
Income tax expense (recovery) $ 29.5 $ (17.0) $ 27.6