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Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash and Cash Equivalents      
Cash deposits $ 571.4 $ 541.4  
Term deposits 850.5 655.1  
Cash and cash equivalents $ 1,421.9 $ 1,196.5 $ 539.3