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2. Amortized Cost and Fair Value of Debt Securities (Details)
$ in Millions

Sep. 30, 2021

USD ($)

^[1]

Fair Value Disclosures [Abstract]

Mature in less than one year

$ 242.2

Mature in one to five years

106.6

Mature in more than five years

57.6

Total Amortized Cost

406.4

Mature in less than one year

242.6

Mature in one to five years

107.9

Mature in more than five years

58.6

Estimated Fair Value

$ 409.1

[1]

Available-for-sale investments are included in the following accounts in the condensed consolidated balance sheets (in millions):

			September 30, 2021						December 31, 2020
Short-term investments			$	409.1					$	267.5
Other investments			—						0.1
Total			$	409.1					$	267.6

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