Marketable Securities (Summary Of Marketable Securities Classified As Available-For-Sale Securities) (Details) (USD $) In Millions	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Marketable Securities, at Cost	$ 30.5	$ 105.2
Marketable Securities, Estimated Fair Value	30.5	105.2
Government Agency Bonds [Member]
Marketable Securities, at Cost	13.7	78.9
Marketable Securities, Estimated Fair Value	13.7	78.9
Corporate Bonds [Member]
Marketable Securities, at Cost	15.1	15.4
Marketable Securities, Estimated Fair Value	15.1	15.4
Commercial Paper [Member]
Marketable Securities, at Cost	1.7	0.9
Marketable Securities, Estimated Fair Value	1.7	0.9
Certificates Of Deposit [Member]
Marketable Securities, at Cost		10.0
Marketable Securities, Estimated Fair Value		10.0
Municipal Auction Rate Securities [Member]
Available-for-sale Securities, Amortized Cost	6.1	6.2
Marketable Securities, Unrealized Losses	(0.8)	(0.9)
Marketable Securities, Estimated Fair Value	$ 5.3	$ 5.3

- Definition

This item represents the gross unrealized losses for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized losses are the excess of the carrying value of the Available-for-sale Securities over their fair value as of the reporting date. Such gross unrealized losses are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

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