Fair Value Measurements (Tables)

3 Months Ended

Jun. 30, 2019

Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings [Abstract]

Summary of Assets Measured at Fair Value on a Recurring Basis

Assets measured at fair value on a recurring basis at June 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	$	3.8	$	—	$	3.8
Short-term investments:
Marketable equity securities	3.1		—		3.1
Total assets measured at fair value	$	6.9	$	—	$	6.9

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