Financial Instruments - Marketable Equity Securities (Details) - Marketable Equity Securities - USD ($) $ in Millions	Oct. 02, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Current assets	$ 2.7	$ 9.3
Other long-term assets	55.1	49.4
Marketable equity securities	$ 57.8	$ 58.7

Amount of investment in marketable security.

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Amount of investment in marketable security, classified as current.

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