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Financial Instruments and Risk Management - Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial Instruments [Abstract]        
Cash $ 364.0 $ 384.4    
Cash equivalents 10.5 9.6    
Cash and cash equivalents $ 374.5 $ 394.0 $ 463.8 $ 479.5