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2. Amortized Cost and Fair Value of Debt Securities (Details) $ in Millions	Sep. 30, 2018 USD ($)
Fair Value Disclosures [Abstract]
Mature in less than one year	$ 170.3
Mature in one to five years	164.9
Mature in more than five years	47.4
Total Amortized Cost	382.6
Mature in less than one year	170.0
Mature in one to five years	163.3
Mature in more than five years	46.2
Estimated Fair Value	$ 379.5

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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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