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Income Taxes - Other (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Current income tax expense    
Expense for the year $ 99.8 $ 86.0
Adjustments in respect of prior years (4.1) 1.0
Current income tax expense 95.7 87.0
Origination and reversal of temporary differences 34.9 54.5
Impact of changes in tax rates 1.2 (1.1)
Change in unrecognized deductible temporary differences   (12.9)
Adjustments in respect of prior years 1.6 (2.4)
Other (0.3) (1.0)
Deferred income tax expense 37.4 37.1
Income tax expense $ 133.1 $ 124.1