Marketable Investment Securities (Tables)

6 Months Ended

Dec. 31, 2015

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 December 31, 2015 and June 30, 2015 were as follows:


	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses			Estimated fair value
At December 31, 2015:
Cash and cash equivalents:
Cash	$	114.0	$	—	$	—		$	114.0
Cash equivalents		20.7		—		—			20.7

Total cash and cash equivalents		134.7		—		—			134.7

Available-for-sale:
Corporate bonds and notes		45.5		—		(0.1	)		45.4
Municipal bonds		66.5		0.1		(0.1	)		66.5
Federal agency issues		38.9		—		—			38.9

Total	$	285.6	$	0.1	$	(0.2	)	$	285.5


	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 December 31, 2015:


	Amortized cost		Estimated fair value
Cash	$	114.0	$	114.0
Cash equivalents		20.7		20.7
Available-for-sale:
Due within one year		84.6		84.6
Due after one year through five years		66.3		66.2
Due after five years		—		—

Total	$	285.6	$	285.5