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Marketable Investment Securities - Schedule of Debt Securities Available-For-Sale in Gross Unrealized Loss Position (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 60.0	$ 18.6
Unrealized losses, Less than 12 months	0.2
Fair Value, More than 12 months	0.7	7.8
Unrealized losses, More than 12 months	0.0	0.0
Fair value, Total	60.7	26.4
Unrealized losses, Total	0.2
Corporate Bonds and Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	29.9	5.0
Unrealized losses, Less than 12 months	0.1
Fair Value, More than 12 months		1.5
Unrealized losses, More than 12 months	0.0	0.0
Fair value, Total	29.9	6.5
Unrealized losses, Total	0.1
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	13.3	7.6
Fair Value, More than 12 months	0.7	6.3
Unrealized losses, More than 12 months	0.0	0.0
Fair value, Total	14.0	13.9
Federal Agency Issues [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	11.5	6.0
Unrealized losses, Less than 12 months	0.1
Unrealized losses, More than 12 months	0.0	0.0
Fair value, Total	11.5	$ 6.0
Unrealized losses, Total	0.1
US Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	5.3
Unrealized losses, More than 12 months	0.0
Fair value, Total	$ 5.3

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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+ References

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-Publisher FASB
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