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v3.19.2

Summary of Significant Accounting Policies - Narrative (Details) $ in Millions | 12 Months Ended
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Jun. 30, 2019 USD ($) facility | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Summary of significant accounting policies |  |  |
Discounts, rebates, returns and allowances | $ 22.6 | $ 26.5 | $ 23.8
Research and development expenditures | 23.3 | 19.3 | 16.9
Inventory accounted under method other than LIFO | 173.2 | 138.6 |
Capitalized software amortization expense | 6.1 | 5.1 | $ 5.2
Carrying value of computer software | $ 123.8 | $ 101.8 |
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 | 11.00% | 12.00% | 11.00%
Customer | Accounts Receivable | Arconic |  |  |
Summary of significant accounting policies |  |  |
Concentration risk | 12.00% |  |
Minimum |  |  |
Summary of significant accounting policies |  |  |
Ownership interest percentage by parent | 20.00% |  |
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 |  |  |
Summary of significant accounting policies |  |  |
Ownership interest percentage by parent | 50.00% |  |
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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