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Cash, Cash Equivalents and Short-Term Investments - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Cash, Cash Equivalents and Short-Term Investments
Cash accounts in banking institutions	$ 1.2	$ 10.6
Money market funds	139.3	$ 230.0
Accrued interest receivable	$ 0.2

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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