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Financial Instruments - Exposure to Credit Risk (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of credit risk exposure [line items]      
Cash and investments $ 399.6 $ 107.0 $ 283.6
Credit risk      
Disclosure of credit risk exposure [line items]      
Cash and investments 399.6 107.0  
Trade accounts receivable 17.5 28.7  
Current advances to suppliers 10.4 8.9  
Employee loans $ 0.0 $ 0.3