Other Income, Net (Other Income, Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Other Income, Net [Abstract]
Interest income on corporate funds	$ (18.6)	$ (18.3)
Realized gains on available-for-sale securities	(0.9)	(1.0)
Realized losses on available-for-sale securities	0.9	0.2
Gain on the sale of notes receivable (see Note 7)	0.0	(1.4)
Gain on sale of AMD (see Note 3)	(29.1)	0.0
Other income, net	$ (47.7)	$ (20.5)