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Income Taxes - Income tax expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Taxes    
Expense for the year $ 73.0 $ 99.8
Adjustments in respect of prior years 2.6 (4.1)
Current income tax expense 75.6 95.7
Origination and reversal of temporary differences 22.8 34.9
Impact of changes in tax rates (0.9) 1.2
Change in unrecognized deductible temporary differences (8.1)  
Adjustments in respect of prior years (2.9) 1.6
Other (0.5) (0.3)
Deferred income tax expense 26.6 37.4
Income tax expense $ 102.2 $ 133.1