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, 2021	Dec. 31, 2020
Schedule Of Cash Cash Equivalents And Short Term Investments [Line Items]
Cash	$ 170.8	$ 204.4
Money market funds	6.6	14.5
Short term deposits	94.5	36.8
Total Cash and cash equivalents	271.9	255.7
Short-term bank deposits	492.5	214.5
Marketable securities:
Government and corporate debentures	929.3	1,217.5
Total Marketable securities	3,019.0	3,529.4
Total Cash and cash equivalents, short-term bank deposits and marketable securities	3,783.4	3,999.6
Government And Corporate Debentures Fixed Interest Rate [Member]
Marketable securities:
Government and corporate debentures	2,262.5	2,626.9
Government Sponsored Enterprises Debentures [Member]
Marketable securities:
Government and corporate debentures	641.4	714.7
Government And Corporate Debentures Floating Interest Rate [Member]
Marketable securities:
Government and corporate debentures	$ 115.1	$ 187.8

Schedule of cash cash equivalents and short term investments.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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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. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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A bank's noninterest bearing demand deposits in other banks (such as correspondents).

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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