Marketable Securities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Summary of marketable securities
Proceeds from sales and maturities of marketable securities	$ 0.1	$ 30.5	$ 166.0
Municipal auction rate securities
Summary of marketable securities
Available-for-sale securities, Cost	5.9	6.0
Available-for-sale securities, Unrealized Losses	(0.5)	(1.0)
Available-for-sale securities, Estimated Fair Value - Non-current	$ 5.4	$ 5.0

Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

+ References+ Details

Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer.

+ References

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+ Details

- Definition

The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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+ Details