Cash and Cash Equivalents (Tables)

9 Months Ended

Sep. 30, 2020

Cash and Cash Equivalents [Abstract]

Schedule of Cash and Cash Equivalents

Cash and cash equivalents consisted of the following as of September 30, 2020 (unaudited):

(in millions)	Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Current assets:
Cash	$	204.9	$	—	$	—	$	204.9
Cash equivalents:
Corporate debt securities	17.6		—		—		17.6
Money market mutual funds	82.4		—		—		82.4
Total cash equivalents	100.0		—		—		100.0
Total cash and cash equivalents	$	304.9	$	—	$	—	$	304.9

Cash and cash equivalents consisted of $41.4 million of cash as of December 31, 2019.

Schedule of Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value

The following table summarizes the fair value of our available-for-sale securities that have been in a continuous unrealized loss position as of September 30, 2020:

	September 30, 2020		December 31, 2019
(in millions)	Less Than Twelve Months	More Than Twelve Months	Less Than Twelve Months	More Than Twelve Months
	(Unaudited)
Corporate debt securities	$17.6	$0.0	N/A	N/A