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2. Amortized Cost and Fair Value of Debt Securities (Details) $ in Millions	Mar. 31, 2022 USD ($)	[1]
Fair Value Disclosures [Abstract]
Mature in less than one year	$ 519.2
Mature in one to five years	556.2
Mature in more than five years	135.1
Total Amortized Cost	1,210.5
Mature in less than one year	518.3
Mature in one to five years	552.8
Mature in more than five years	134.5
Estimated Fair Value	$ 1,205.6
[1] Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.

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