Inventories - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Reduction to net loss resulting from effect of LIFO inventory liquidation	$ 0.8	$ 0.3	$ 1.7	$ 0.3