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Income Taxes - Income tax expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Income Taxes        
Current income tax expense $ 44.4 $ 20.0 $ 66.5 $ 39.5
Deferred income tax expense 50.9 7.0 56.3 15.1
Income tax expense $ 95.3 $ 27.0 $ 122.8 $ 54.6