Restructuring Charges and Asset Impairment Charges - Schedule of Activity and Reserve Balances for Restructuring (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Restructuring Reserve [Roll Forward]
Reserve balance beginning of year	$ 2.3	$ 0.0
Restructuring charges and asset impairment charges	18.0	29.1	$ 0.0
Cash payments	(3.0)	(10.9)
Payments from qualified pension plan associated with restructuring charges	(9.4)	(8.3)
Non-cash asset impairment charges and other	(7.6)	(7.6)
Reserve balance end of year	$ 0.3	$ 2.3	$ 0.0