Other Income, Net (Other Income, Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2012 building	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Component of Other Income, Nonoperating [Line Items]
Number of buildings sold	2
Interest income on corporate funds	$ (21.5)	$ (27.2)	$ (45.3)	$ (56.8)
Realized gains on available-for-sale securities	(9.8)	(14.8)	(14.6)	(19.1)
Realized losses on available-for-sale securities	0.5	6.6	0.8	6.9
Impairment Losses on Available-for-sale Securities	0	5.8	0	5.8
Gain (Loss) on Sale of Properties	(2.2)	0	(2.2)	0
Gain (Loss) on Disposition of Assets	0	(66.0)	0	(66.0)
Other, net	0	(0.6)	(0.9)	(1.2)
Other income, net	$ 33.0	$ 96.2	$ 62.2	$ 130.4