Other Income, Net (Other Income, Net) (Details) $ in Millions	12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($) building	Jun. 30, 2013 USD ($)
Other Income, Net [Abstract]
Interest income on corporate funds	$ (56.9)	$ (53.7)	$ (62.9)
Realized gains on available-for-sale securities	(6.8)	(20.4)	(32.1)
Realized losses on available-for-sale securities	1.9	3.9	3.5
Gains on sales of buildings	0.0	0.0	(2.2)
Gain on sale of notes receivable	(1.4)	0.0	0.0
Other, net	0.0	0.0	(0.7)
Other income, net	$ (63.2)	$ (70.2)	$ (94.4)
Number of buildings sold | building		2