Investments in Marketable Securities (Tables)

12 Months Ended

Jun. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of Investments in Marketable Securities

The following table summarizes the Company's investments in marketable securities:

	June 30, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in millions)
Corporate bonds	$	367.7	$	0.2	$	—	$	367.9
U.S. treasury securities	64.9		0.2		—		65.1
Commercial paper	49.5		—		—		49.5
Supranational securities	31.1		—		—		31.1
Certificate of deposits	7.8		—		—		7.8
	$	521.1	$	0.4	$	—	$	521.5
Less: Restricted marketable securities (1)							$	49.5
Total marketable securities							$	472.0

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(1) The Company is required to pledge or otherwise restrict a portion of cash, cash equivalents, and marketable securities as collateral for standby letters of credit. The Company classifies marketable securities with use restrictions of less than twelve months as "Prepaid expenses and other current assets" and of twelve months or longer as non-current "Other assets" on its consolidated balance sheets.

	June 30, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in millions)
Corporate bonds	$	397.7	$	2.1	$	(0.2)	$	399.6
U.S. treasury securities	300.5		1.9		—		302.4
Commercial paper	17.4		—		—		17.4
Certificate of deposits	38.6		0.1		—		38.7
	$	754.2	$	4.1	$	(0.2)	$	758.1
Less: Restricted marketable securities (1)							$	38.5
Total marketable securities							$	719.5

_________________________

(1) The Company is required to pledge or otherwise restrict a portion of cash, cash equivalents, and marketable securities as collateral for standby letters of credit. The Company classifies marketable securities with use restrictions of less than twelve months as "Prepaid expenses and other current assets" and of twelve months or longer as non-current "Other assets" on its consolidated balance sheets.