Marketable Investment Securities (Tables)

3 Months Ended

Sep. 30, 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 September 30, 2016 and June 30, 2016 were as follows:


	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Estimated fair value
At September 30, 2016:
Cash and cash equivalents:
Cash	$	61.1	$	—	$	—	$	61.1
Cash equivalents		25.8		—		—		25.8

Total cash and cash equivalents		86.9		—		—		86.9

Available-for-sale:
Corporate bonds and notes		45.4		0.1		—		45.5
Municipal bonds		52.2		0.1		—		52.3
Federal agency issues		12.6		—		—		12.6
US government securities		3.3		—		—		3.3

Total	$	200.4	$	0.2	$	—	$	200.6


	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Estimated fair value
At June 30, 2016:
Cash and cash equivalents:
Cash	$	66.1	$	—	$	—	$	66.1
Cash equivalents		2.4		—		—		2.4

Total cash and cash equivalents		68.5		—		—		68.5

Available-for-sale:
Corporate bonds and notes		50.8		0.2		—		51.0
Municipal bonds		85.4		0.2		—		85.6
Federal agency issues		25.5		—		—		25.5
US government securities		8.2		0.1		—		8.3

Total	$	238.4	$	0.5	$	—	$	238.9

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 September 30, 2016:


	Amortized		Estimated
	cost		fair value
Cash	$	61.1	$	61.1
Cash equivalents		25.8		25.8
Available-for-sale:
Due within one year		61.5		61.5
Due after one year through five years		52.0		52.2
Due after five years		—		—

Total	$	200.4	$	200.6