Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Other Income and Expenses [Abstract]
Interest income on corporate funds	$ (25.7)	$ (28.1)	$ (58.0)	$ (56.6)
Realized gains on available-for-sale securities	(7.6)	(0.3)	(10.1)	(0.6)
Realized losses on available-for-sale securities	0.5	0.8	0.7	2.0
Impairment of intangible assets	0.0	0.0	0.0	12.1
Gain on sale of assets	0.0	(4.1)	(1.9)	(4.1)
Gain on sale of investment	(0.2)	0.0	(0.2)	0.0
Non-service components of pension expense, net	(13.0)	(0.9)	(31.1)	0.7
Other income, net	$ (46.0)	$ (32.6)	$ (100.6)	$ (46.5)