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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions | 12 Months Ended
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Jun. 30, 2018 USD ($) facility | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Summary of significant accounting policies |  |  |
Proceeds received from sale of equity method investment | $ 0.0 | $ 0.0 | $ 6.3
Note receivables recorded from sale of equity method investment |  |  | 12.6
Proceeds from note receivable from the sale of equity method investment | 6.3 | 6.3 | 0.0
Discounts, rebates, returns and allowances | 26.5 | 23.8 | 29.8
Research and development expenditures | 19.3 | 16.9 | 16.3
Inventory accounted under method other than LIFO | 138.6 | 107.3 |
Capitalized software amortization expense | 5.1 | 5.2 | $ 5.5
Carrying value of computer software | $ 101.8 | $ 71.0 |
Number of former operating facility site that the liability for future costs is discounted to present value (facility) | facility | 1 |  |
Liability for future costs discount amortization period | 20 years |  |
Environmental expenditures, discount rate | 3.00% | 3.00% |
Environmental expenditures, liability | $ 11.0 | $ 11.0 |
Customer | Sales Revenue | Arconic |  |  |
Summary of significant accounting policies |  |  |
Concentration risk | 12.00% | 11.00% | 13.00%
Minimum | Computer software |  |  |
Summary of significant accounting policies |  |  |
Estimated useful life | 3 years |  |
Minimum | Intangible Assets |  |  |
Summary of significant accounting policies |  |  |
Estimated useful life | 5 years |  |
Maximum | Computer software |  |  |
Summary of significant accounting policies |  |  |
Estimated useful life | 7 years |  |
Maximum | Intangible Assets |  |  |
Summary of significant accounting policies |  |  |
Estimated useful life | 30 years |  |

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