Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Interest income on corporate funds	$ (28.1)	$ (22.7)	$ (56.6)	$ (48.5)
Realized gains on available-for-sale securities	(0.3)	(0.2)	(0.6)	(0.5)
Realized losses on available-for-sale securities	0.8	1.2	2.0	1.6
Impairment of intangible assets	0.0	0.0	12.1	0.0
Gain (Loss) on Disposition of Assets	4.1	0.0	4.1	0.4
Non-service components of pension expense, net (see Note 2)	(0.9)	(16.5)	0.7	(33.0)
Other income, net	$ (32.6)	$ (38.2)	$ (46.5)	$ (80.8)