Financial Instruments - Marketable Equity Securities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Investments, All Other Investments [Abstract]
Other current assets	$ 3.5	$ 9.3
Other long-term assets	58.8	49.4
Marketable equity securities	$ 62.3	$ 58.7

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Amount of investment in marketable security.

+ References

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Amount of investment in marketable security, classified as current.

+ References

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Amount of investment in marketable security, classified as noncurrent.

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-Name Accounting Standards Codification
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