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Investments in Marketable Securities
12 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Investments in Marketable Securities Investments in Marketable Securities
The following table summarizes the Company's investments in marketable securities:
June 30, 2020
Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
(in millions)
Corporate bonds$397.7 $2.1 $(0.2)$399.6 
U.S. treasury securities300.5 1.9  302.4 
Commercial paper17.4   17.4 
Certificate of deposits38.6 0.1  38.7 
$754.2 $4.1 $(0.2)$758.1 
Less: Restricted marketable securities (1)
$38.5 
Total marketable securities$719.5 
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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 cash, cash equivalents, and 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, 2019
Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
(in millions)
Commercial paper$97.6 $ $ $97.6 
Corporate bonds61.9 0.1  62.0 
Certificate of deposits34.8   34.8 
U.S. treasury securities29.7 0.1  29.8 
Total marketable securities (1)
$224.1 $0.2 $ $224.3 
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(1) Includes $8.3 million included within cash and cash equivalents