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2. Amortized Cost and Fair Value of Debt Securities (Details) $ in Millions	Mar. 31, 2021 USD ($)
Fair Value Disclosures [Abstract]
Mature in less than one year	$ 173.6
Mature in one to five years	66.2
Mature in more than five years	39.0
Total Amortized Cost	278.8
Mature in less than one year	174.1
Mature in one to five years	67.9
Mature in more than five years	40.3
Estimated Fair Value	$ 282.3

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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).

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