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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 |

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