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3. Fair Value Measurements Amortized Cost and Fair Value of Debt Securities (Details) $ in Millions	Dec. 31, 2019 USD ($)
Fair Value Disclosures [Abstract]
Mature in less than one year	$ 174.5
Mature in one to five years	164.2
Mature in more than five years	62.2
Total Amortized Cost	400.9
Mature in less than one year	174.6
Mature in one to five years	165.2
Mature in more than five years	63.1
Estimated Fair Value	$ 402.9

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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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