Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Gain (Loss) on Disposition of Assets	$ 0.0	$ 0.4
Interest income on corporate funds	(28.5)	(25.8)
Realized gains on available-for-sale securities	(0.4)	(0.3)
Realized losses on available-for-sale securities	1.3	0.3
Impairment of intangible assets	12.1	0.0
Non-service components of pension expense, net (see Note 2)	1.6	(16.4)
Other income, net	$ (13.9)	$ (42.6)