Other Income, Net (Other Income, Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013 building	Mar. 31, 2014	Mar. 31, 2013
Other Income, Net [Abstract]
Interest income on corporate funds	$ (6.7)	$ (6.0)	$ (42.4)	$ (51.3)
Realized gains on available-for-sale securities	(2.2)	(6.7)	(19.7)	(21.3)
Realized losses on available-for-sale securities	0.7	0.7	3.2	1.5
Gains on sales of buildings	0	0	0	(2.2)
Other, net	(0.1)	0	(0.2)	(0.9)
Other income, net	$ (8.3)	$ (12.0)	$ (59.1)	$ (74.2)
Number of buildings sold		2