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Income Taxes - Movement in net deferred tax liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income taxes    
Balance, beginning of year $ 113.1 $ 86.0
Recognized in net (loss) income 26.6 37.4
Recognized in other comprehensive income (loss) 1.1 (5.6)
Other 2.3 (4.7)
Balance, end of year $ 143.1 $ 113.1