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3. Amortized Cost and Fair Value of Debt Securities (Details) $ in Millions	Jun. 30, 2019 USD ($)
Fair Value Disclosures [Abstract]
Mature in less than one year	$ 127.0
Mature in one to five years	168.5
Mature in more than five years	56.2
Total Amortized Cost	351.7
Mature in less than one year	127.1
Mature in one to five years	169.5
Mature in more than five years	57.0
Estimated Fair Value	$ 353.6

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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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