Other Income, Net (Other Income, Net) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Other Income and Expenses [Abstract]
Interest income on corporate funds	$ (21.3)	$ (17.3)	$ (44.3)	$ (35.9)
Realized gains on available-for-sale securities	(2.0)	(0.5)	(2.5)	(1.5)
Realized losses on available-for-sale securities	0.7	4.3	1.1	5.3
Gain on sale of businesses (see Note 4)	(205.4)		(205.4)
Gain on sale of businesses (see Note 4)		0.0		(29.1)
Gain on sale of building	0.0	(13.9)	0.0	(13.9)
Other income, net	$ (228.0)	(27.4)	$ (251.1)	(75.1)
Available-for-sale securities, accumulated gross unrealized loss, before tax		$ 3.6		$ 3.6