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Financial Instruments - Marketable Equity Securities (Details) - Marketable Equity Securities - USD ($)
$ in Millions
Oct. 03, 2020
Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]    
Current assets $ 8.9 $ 17.1
Other long-term assets 41.9 42.1
Marketable equity securities $ 50.8 $ 59.2