Other Income, Net (Other Income, Net) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Other Income, Net [Abstract]
Interest income on corporate funds		$ (62.4)	$ (56.9)	$ (53.7)
Realized gains on available-for-sale securities		(5.1)	(6.8)	(20.4)
Realized losses on available-for-sale securities		10.1	1.9	3.9
Gain on sale of building	$ 13.9	13.9	0.0	0.0
Proceeds from the sale of notes receivable		0.0	226.7	0.0
Gain on sale of notes receivable		0.0	(1.4)	0.0
Gain on Disposition of AMD		(29.1)	0.0	0.0
Other income, net		$ (100.4)	$ (63.2)	$ (70.2)