Investments (Tables)

3 Months Ended

Mar. 31, 2022

Schedule Of Investments [Abstract]

Schedule of Fair Value of Cash Equivalents, Long and Short Term Investments

The fair value of the cash equivalents, long- and short-term investments are disclosed below (amounts in millions).

	March 31, 2022
	Investment Level	Amortized Cost (Carrying Value)			Gross Unrealized Holding Losses		Estimated Fair Value
Commercial bonds and paper	Level 2	$	119.5		$	0.8	$	118.8
Money market funds	Level 1		50.7			—		50.7
U.S. Treasuries	Level 2		49.3			0.5		48.8
Total cash equivalents and investments		$	219.5		$	1.3	$	218.3
Less cash equivalents			(53.8	)		—		(53.8	)
Total Investments		$	165.7		$	1.3	$	164.5

	December 31, 2021
	Investment Level	Amortized Cost (Carrying Value)			Gross Unrealized Holding Losses		Estimated Fair Value
Commercial bonds and paper	Level 2	$	115.2		$	0.2	$	115.0
Money market funds	Level 1		21.3			—		21.3
U.S. Treasuries	Level 2		23.9			0.1		23.8
Total cash equivalents and investments		$	160.4		$	0.3	$	160.1
Less cash equivalents			(23.8	)		—		(23.8	)
Total Investments		$	136.6		$	0.3	$	136.3