Spin Costs - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Spin-off costs			$ 2.8		$ 11.6
Costs incurred and allocated for the spin-off						$ 197.6
Spin-off
Restructuring Cost and Reserve [Line Items]
Spin-off costs	$ (2.5)	$ (1.3)	0.9	$ (3.8)	1.0
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Spin-off costs			2.0		10.2
Cost of Products Sold
Restructuring Cost and Reserve [Line Items]
Spin-off costs			$ (0.1)		$ 0.4