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Acquisitions and Divestiture - Narrative (Details) $ in Millions |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 22, 2018 USD ($) | Feb. 21, 2018 USD ($) | Jun. 29, 2017 USD ($) transaction | Feb. 28, 2017 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Asset purchase price, net of cash acquired |  |  |  |  | $ 79.0 | $ 13.3 | $ 35.3
Goodwill |  |  |  |  | 326.4 | 268.7 | 263.4
Proceeds from sale of business |  |  |  |  | $ 0.0 | 0.0 | $ 12.0
Discontinued Operations, Disposed of by Sale | Specialty Steel Supply |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of separate transactions to complete the divestiture | transaction |  |  | 2 |  |  |  |
Proceeds from sale of business |  |  | $ 12.0 |  |  |  |
Pre tax loss from divestiture |  |  | $ 3.2 |  |  |  |
LPW Technology Ltd |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Asset purchase price, net of cash acquired | $ 79.0 |  |  |  |  |  |
Accounts receivable | 2.1 |  |  |  |  |  |
Inventory | 4.5 |  |  |  |  |  |
Other current assets | 0.5 |  |  |  |  |  |
Property and equipment | 11.9 |  |  |  |  |  |
Goodwill | 59.0 |  |  |  |  |  |
Accounts payable | 4.4 |  |  |  |  |  |
Current liabilities | 2.5 |  |  |  |  |  |
Other liabilities | 3.5 |  |  |  |  |  |
Identifiable intangible assets | $ 11.4 |  |  |  |  |  |
MB CalRAM LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Property and equipment |  | $ 2.6 |  |  |  |  |
Goodwill |  | 5.3 |  |  |  |  |
Asset purchase price |  | 13.3 |  |  |  |  |
Working capital acquired |  | 0.2 |  |  |  |  |
Identifiable intangible assets |  | $ 5.2 |  |  |  |  |
Puris LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Property and equipment |  |  |  |  |  | 6.5 |
Goodwill |  |  |  |  |  | 18.6 |
Asset purchase price |  |  |  | $ 35.3 |  |  |
Working capital acquired |  |  |  |  |  | 1.7 |
Identifiable intangible assets |  |  |  |  |  | $ 8.5 |

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