Marketable Investment Securities (Tables)

12 Months Ended

Jun. 30, 2015

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 June 30, 2015 and 2014 were as follows:


	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


	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses			Estimated fair value
At June 30, 2014:
Cash and cash equivalents:
Cash	$	45.2	$	—	$	—		$	45.2
Cash equivalents		19.6		—		—			19.6

Total cash and cash equivalents		64.8		—		—			64.8

Available-for-sale:
Corporate bonds and notes		44.5		—		—			44.5
Municipal bonds		137.8		0.3		—			138.1
Federal agency issues		23.1		—		—			23.1

Total	$	270.2	$	0.3	$	—		$	270.5

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

Cash, cash equivalents, and maturities of debt securities classified as available-for-sale are as follows at June 30, 2015:


	Amortized cost		Estimated fair value
Cash	$	54.7	$	54.7
Cash equivalents		9.4		9.4
Available-for-sale:
Due within one year		80.7		80.7
Due after one year through five years		40.6		40.6
Due after five years		—		—

Total	$	185.4	$	185.4

Schedule of Debt Securities Available-For-Sale in Gross Unrealized Loss Position

Debt securities available-for-sale in a gross unrealized loss position as of June 30, 2015 and 2014 are summarized as follows:


	Less than 12 months					More than 12 months				Total
	Fair value		Unrealized losses			Fair value		Unrealized losses		Fair value		Unrealized losses
At June 30, 2015:
Debt securities:
Corporate bonds and notes		24.4		(0.0	)		—		—		24.4		(0.0	)
Municipal bonds		24.8		(0.1	)		—		—		24.8		(0.1	)
Federal agency issues		1.9		(0.0	)		—		—		1.9		(0.0	)

	$	51.1	$	(0.1	)	$	—	$	—	$	51.1	$	(0.1	)


	Less than 12 months					More than 12 months				Total
	Fair value		Unrealized losses			Fair value		Unrealized losses		Fair value		Unrealized losses
At June 30, 2014:
Debt securities:
Corporate bonds and notes		16.0		(0.0	)		—		—		16.0		(0.0	)
Municipal bonds		8.6		(0.0	)		—		—		8.6		(0.0	)
Federal agency issues		5.0		(0.0	)		—		—		5.0		(0.0	)

	$	29.6	$	(0.0	)	$	—	$	—	$	29.6	$	(0.0	)