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3. Fair Value Measurements Amortized Cost and Fair Value of Debt Securities (Details) $ in Millions	Dec. 31, 2020 USD ($)
Fair Value Disclosures [Abstract]
Mature in less than one year	$ 130.9
Mature in one to five years	88.1
Mature in more than five years	43.2
Total Amortized Cost	262.2
Mature in less than one year	131.5
Mature in one to five years	90.5
Mature in more than five years	45.6
Estimated Fair Value	$ 267.6

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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