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Financial Instruments - Marketable Equity Securities (Details) - Marketable Equity Securities - USD ($)
$ in Millions
Jul. 03, 2021
Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]    
Current assets $ 2.7 $ 9.3
Other long-term assets 53.7 49.4
Marketable equity securities $ 56.4 $ 58.7