Inventories - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Jun. 30, 2015
Inventory, Net [Abstract]
Other than LIFO inventory	$ 120.5		$ 120.5		$ 154.9
Non-cash excess inventory write-down	$ 22.5	$ 0.0	$ 22.5	$ 0.0