Other Income, Net (Other Income, Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012 building	Dec. 31, 2013	Dec. 31, 2012
Other Income, Net [Abstract]
Interest income on corporate funds	$ (16.7)	$ (21.5)	$ (35.7)	$ (45.3)
Realized gains on available-for-sale securities	(13.2)	(9.8)	(17.5)	(14.6)
Realized losses on available-for-sale securities	1.6	0.5	2.5	0.8
Gains on sales of buildings	0	(2.2)	0	(2.2)
Other, net	0	0	(0.1)	(0.9)
Other income, net	$ (28.3)	$ (33.0)	$ (50.8)	$ (62.2)
Number of buildings sold		2