Held-To-Maturity Investments (Schedule Of Held-To-Maturity Investments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Jun. 30, 2011
Held-To-Maturity Investments [Abstract]
Current portion of held-to-maturity investments	$ 92.8	[1]	$ 93.2	[1]
Long-term portion of held-to-maturity investments	0	[2]	48.8	[2]
Total held-to-maturity investments	$ 92.8		$ 142.0

[1] Included in prepaid expenses and other in our condensed consolidated balance sheets.

[2] Included in other long-term assets in our condensed consolidated balance sheets.