Inventories - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Schedule of Inventory [Line Items]
Beneficial effect of LIFO inventory liquidation	$ (1.1)	$ (4.9)	$ 0.0
Reduction to net loss resulting from effect of LIFO inventory liquidation		$ 4.9		$ 1.1