Other Expense/(Income), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Other Income, Net [Abstract]
Interest income on corporate funds	$ (83.5)	$ (76.7)	$ (62.4)
Realized gains on available-for-sale securities	(2.0)	(5.3)	(5.1)
Realized losses on available-for-sale securities	4.5	3.1	10.1
Gain on sale of businesses (see Note 3)	0.0	(205.4)	(29.1)
Gains on sale of assets	0.7	0.0	13.9
Voluntary Early Retirement Program (see Note 11)	319.6	0.0	0.0
Other expense/(income), net	$ 237.9	$ (284.3)	$ (100.4)