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3. Fair Value Measurements Amortized Cost and Fair Value of Debt Securities (Details) $ in Millions	Dec. 31, 2022 USD ($)	[1]
Fair Value Disclosures [Abstract]
Mature in less than one year	$ 323.9
Mature in one to five years	834.9
Mature in more than five years	161.8
Total Amortized Cost	1,320.6
Mature in less than one year	321.4
Mature in one to five years	820.8
Mature in more than five years	157.8
Estimated Fair Value	$ 1,300.0
[1] Available-for-sale investments are included in Short-term investments in the consolidated balance sheets.

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