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2. Amortized Cost and Fair Value of Debt Securities (Details) $ in Millions	Jun. 30, 2022 USD ($)	[1]
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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