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Income Taxes - Movement in net deferred tax liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income taxes    
Balance, beginning of year $ 86.0 $ 46.4
Recognized in net income 37.4 37.1
Recognized in other comprehensive income (5.6) 3.5
Recognized in equity   (0.4)
Other (4.7) (0.6)
Balance, end of year $ 113.1 $ 86.0