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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, 2018	Jun. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$ 69.5	$ 60.0
Unrealized losses, Less than 12 months	0.4	0.2
Fair Value, More than 12 months	21.8	0.7
Unrealized losses, More than 12 months	0.2	0.0
Fair value, Total	91.3	60.7
Unrealized losses, Total	0.6	0.2
Corporate Bonds and Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	35.6	29.9
Unrealized losses, Less than 12 months	0.2	0.1
Fair Value, More than 12 months	9.8
Unrealized losses, More than 12 months	0.1	0.0
Fair value, Total	45.4	29.9
Unrealized losses, Total	0.3	0.1
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	24.6	13.3
Unrealized losses, Less than 12 months	0.1
Fair Value, More than 12 months	0.5	0.7
Unrealized losses, More than 12 months	0.0	0.0
Fair value, Total	25.1	14.0
Unrealized losses, Total	0.1
Federal Agency Issues [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	3.0	11.5
Unrealized losses, Less than 12 months	0.0	0.1
Fair Value, More than 12 months	9.5
Unrealized losses, More than 12 months	0.1	0.0
Fair value, Total	12.5	11.5
Unrealized losses, Total	0.2	0.1
US Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	6.3	5.3
Fair Value, More than 12 months	2.0
Unrealized losses, More than 12 months	0.0	0.0
Fair value, Total	$ 8.3	$ 5.3

X

- 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

No definition available.

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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