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3. Amortized Cost and Fair Value of Debt Securities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Fair Value Disclosures [Abstract]
Mature in less than one year	$ 129.9
Mature in one to five years	175.8
Mature in more than five years	52.1
Total Amortized Cost	357.8
Mature in less than one year	129.8
Mature in one to five years	175.8
Mature in more than five years	52.0
Estimated Fair Value	$ 357.6

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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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