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Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Cash and Cash Equivalents        
Cash deposits $ 519.0 $ 571.4    
Term deposits 920.0 850.5    
Cash and cash equivalents $ 1,439.0 $ 1,421.9 $ 1,295.1 $ 1,196.5