Marketable Investment Securities (Tables)

9 Months Ended

Mar. 31, 2016

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 March 31, 2016 and June 30, 2015 were as follows:


	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses			Estimated fair value
At March 31, 2016:
Cash and cash equivalents:
Cash	$	114.2	$	—	$	—		$	114.2
Cash equivalents		6.3		—		—			6.3

Total cash and cash equivalents		120.5		—		—			120.5

Available-for-sale:
Corporate bonds and notes		48.5		0.1		(0.1	)		48.5
Municipal bonds		80.6		0.2		—			80.8
Federal agency issues		36.5		0.1		—			36.6

Total	$	286.1	$	0.4	$	(0.1	)	$	286.4


	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses			Estimated fair value
At June 30, 2015:
Cash and cash equivalents:
Cash	$	54.7	$	—	$	—		$	54.7
Cash equivalents		9.4		—		—			9.4

Total cash and cash equivalents		64.1		—		—			64.1

Available-for-sale:
Corporate bonds and notes		41.8		—		—			41.8
Municipal bonds		66.3		0.1		(0.1	)		66.3
Federal agency issues		13.2		—		—			13.2

Total	$	185.4	$	0.1	$	(0.1	)	$	185.4

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

Cash, cash equivalents, and maturities of debt securities classified as available-for-sale securities are as follows at March 31, 2016:


	Amortized cost		Estimated fair value
Cash	$	114.2	$	114.2
Cash equivalents		6.3		6.3
Available-for-sale:
Due within one year		96.2		96.2
Due after one year through five years		69.4		69.7
Due after five years		—		—

Total	$	286.1	$	286.4