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Income Taxes - Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income taxes    
Net income before income taxes $ 833.7 $ 857.8
Statutory tax rate (as a percent) 26.50% 26.50%
Tax expense at statutory rate $ 220.9 $ 227.3
Reconciling items    
Change in unrecognized deductible temporary differences   (12.9)
Income not taxable (2.6) (6.7)
Differences in foreign statutory tax rates (85.1) (83.6)
Differences due to changing future tax rates 1.2 (1.1)
Foreign withholding tax 0.9 2.9
Adjustments in respect of prior years (2.5) (1.4)
Other 0.3 (0.4)
Income tax expense $ 133.1 $ 124.1