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Cash And Cash Equivalents, Short-Term Bank Deposits And Marketable Securities - Schedule Of Cash And Cash Equivalents And Short Term Investments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Cash Cash Equivalents And Short Term Investments [Line Items]
Cash	$ 204.4	$ 182.0
Money market funds	14.5	28.2
Short term deposits	36.8	69.0
Total Cash and cash equivalents	255.7	279.2
Short-term bank deposits	214.5	0.6
Marketable securities:
Total Marketable securities	3,529.4	3,668.9
Total Cash and cash equivalents, short-term bank deposits and marketable securities	3,999.6	3,948.7
Government And Corporate Debentures Fixed Interest Rate [Member]
Marketable securities:
Total Marketable securities	2,626.9	3,008.9
Government Sponsored Enterprises Debentures [Member]
Marketable securities:
Total Marketable securities	714.7	475.6
Government And Corporate Debentures Floating Interest Rate [Member]
Marketable securities:
Total Marketable securities	$ 187.8	$ 184.4

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Schedule of cash cash equivalents and short term investments.

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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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