Other Income, Net (Other Income, Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012 building	Mar. 31, 2013 building	Mar. 31, 2012
Component of Other Income, Nonoperating [Line Items]
Number of buildings sold			2
Buildings with non-binding offers		2
Interest income on corporate funds	$ (6.0)	$ (8.5)	$ (51.3)	$ (65.3)
Realized gains on available-for-sale securities	(6.7)	(4.0)	(21.3)	(23.2)
Realized losses on available-for-sale securities	0.7	0.4	1.5	7.4
Impairment Losses on Available-for-sale Securities	0	0	0	5.8
Impairment losses on assets held for sale	0	2.2	0	2.2
Gain on sale of buildings	0	0	(2.2)	0
Gain (Loss) on Disposition of Assets	0	0	0	(66.0)
Other, net	0	(0.6)	(0.9)	(1.9)
Other income, net	$ (12.0)	$ (10.5)	$ (74.2)	$ (141.0)