Restructuring and Asset Impairment Charges - Schedule of Activity and Reserve Balances for Restructuring (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016
Restructuring Reserve [Roll Forward]
Reserve, beginning balance	$ 0.3	$ 2.3
Restructuring and asset impairment charges		18.0
Payments from qualified pension plan associated with restructuring charges		(9.4)
Cash payments	(0.3)	(3.0)
Non-cash asset impairment charges and other		(7.6)
Reserve, ending balance	$ 0.0	$ 0.3