Fair Value Measurements (Tables)

6 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Summary of Assets Measured at Fair Value on a Recurring Basis

Assets measured at fair value on a recurring basis at September 30, 2019 are as follows (amounts in millions):

	Quoted Prices in Active Markets for  Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Total Balance
Assets
Cash equivalents:
Money market mutual funds	$	1.1	$	—	$	1.1
Short-term investments:
Marketable equity securities	3.3		—		3.3
Total assets measured at fair value	$	4.4	$	—	$	4.4

Assets measured at fair value on a recurring basis at March 31, 2019 are as follows (amounts in millions):

	Quoted Prices in Active Markets for  Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Total Balance
Assets
Cash equivalents:
Money market mutual funds	$	8.3	$	—	$	8.3
Short-term investments:
Marketable equity securities	2.3		—		2.3
Total assets measured at fair value	$	10.6	$	—	$	10.6