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2. Amortized Cost and Fair Value of Debt Securities (Details) $ in Millions | Jun. 30, 2022 USD ($) | [1]
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Fair Value Disclosures [Abstract] |
Mature in less than one year | $ 471.8
Mature in one to five years | 705.3
Mature in more than five years | 152.3
Total Amortized Cost | 1,329.4
Mature in less than one year | 469.2
Mature in one to five years | 696.9
Mature in more than five years | 149.7
Estimated Fair Value | $ 1,315.8
[1] | Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27198-111563 + Details
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