Other Income, Net (Other Income, Net) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2013 building	Jun. 30, 2012 building	Jun. 30, 2011
Component of Other Income, Nonoperating [Line Items]
Interest income on corporate funds	$ (64.5)	$ (85.2)	$ (88.8)
Realized gains on available-for-sale securities	(32.1)	(32.1)	(38.0)
Realized losses on available-for-sale securities	3.5	7.7	3.6
Impairment Losses on Available-for-sale Securities	0	5.8	0
Impairment of Long-Lived Assets to be Disposed of	0	2.2	11.7
Gain (Loss) on Sale of Properties	(2.2)	0	(1.8)
Gain (Loss) on Disposition of Assets	0	(66.0)	0
Other, net	(0.9)	(3.2)	(3.3)
Other income, net	(96.2)	(170.8)	(116.6)
Number of buildings sold	2	2
Investment Building and Building Improvements		$ 6.9