Marketable Investment Securities (Tables)

3 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Schedule of Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security

The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at September 30, 2020 and June 30, 2020 were as follows:


	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Estimated fair value
At September 30, 2020:
Cash and cash equivalents:
Cash	$	68.3	$	—	$	—	$	68.3
Cash equivalents	50.0		—		—		$	50.0
Total cash and cash equivalents	118.3		—		—		118.3
Available-for-sale:
Corporate bonds and notes	40.5		0.6		—		41.1
Municipal bonds	12.6		0.2		—		12.8
Federal agency issues	4.0		0.1		—		4.1
US government securities	14.2		0.1		—		14.3
Total	$	189.6	$	1.0	$	—	$	190.6


	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Estimated fair value
At June 30, 2020:
Cash and cash equivalents:
Cash	$	132.8	$	—	$	—	$	132.8
Cash equivalents	30.9		—		—		30.9
Total cash and cash equivalents	163.7		—		—		163.7
Available-for-sale:
Corporate bonds and notes	50.1		0.8		—		50.9
Municipal bonds	17.8		0.2		—		18.0
Federal agency issues	5.5		0.1		—		5.6
US government securities	16.4		0.2		—		16.6
Total	$	253.5	$	1.3	$	—	$	254.8

Schedule of Cash, Cash Equivalents, and Maturities of Debt Securities Classified as Available-For-Sale Securities

Cash, cash equivalents, and maturities of debt securities classified as available-for-sale securities are as follows at September 30, 2020:


	Amortized cost		Estimated fair value
Cash	$	68.3	$	68.3
Cash equivalents	50.0		50.0
Available-for-sale:
Due within one year	41.8		42.1
Due after one year through five years	29.5		30.2
Due after five years	—		—
Total	$	189.6	$	190.6