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Segment Information, Geographic and Product Data - Schedule of Results of Operation, Depreciation and Amortization, Capital Expenditures and Total Assets by Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales | $ 618.0 | $ 572.2 | $ 487.8 | $ 479.8 | $ 507.7 | $ 473.6 | $ 427.4 | $ 389.0 | $ 2,157.7 | $ 1,797.6 | $ 1,813.4
Consolidated operating income | 59.4 | $ 45.2 | $ 40.8 | $ 41.7 | 44.6 | $ 35.8 | $ 15.4 | $ 1.4 | 187.1 | 97.2 | 51.6
Consolidated depreciation and amortization |  |  |  |  |  |  |  |  | 116.6 | 117.8 | 119.3
Consolidated capital expenditures |  |  |  |  |  |  |  |  | 135.0 | 98.5 | 95.2
Consolidated total assets | 3,007.0 |  |  |  | 2,878.1 |  |  |  | 3,007.0 | 2,878.1 |
Operating |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pension earnings, interest and deferrals |  |  |  |  |  |  |  |  | (2.1) | (23.8) | (19.3)
Corporate costs (including loss on divestiture of business, restructuring and impairment charges) |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated operating income |  |  |  |  |  |  |  |  | (66.4) | (61.3) | (103.0)
Consolidated depreciation and amortization |  |  |  |  |  |  |  |  | 3.9 | 4.0 | 3.8
Consolidated capital expenditures |  |  |  |  |  |  |  |  | 41.6 | 29.7 | 8.6
Consolidated total assets | 193.2 |  |  |  | 167.2 |  |  |  | 193.2 | 167.2 |
Intersegment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  | (75.8) | (30.6) | (26.3)
Consolidated operating income |  |  |  |  |  |  |  |  | (2.9) | 1.5 | 2.5
Consolidated depreciation and amortization |  |  |  |  |  |  |  |  | (0.8) | (0.8) | (0.8)
Consolidated capital expenditures |  |  |  |  |  |  |  |  | (1.8) | (0.4) | (0.2)
Consolidated total assets | (11.9) |  |  |  | (15.5) |  |  |  | (11.9) | (15.5) |
Specialty Alloys Operations | Operating |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  | 1,803.8 | 1,461.6 | 1,481.0
Consolidated operating income |  |  |  |  |  |  |  |  | 232.4 | 172.3 | 176.9
Consolidated depreciation and amortization |  |  |  |  |  |  |  |  | 93.3 | 94.0 | 94.4
Consolidated capital expenditures |  |  |  |  |  |  |  |  | 63.6 | 52.2 | 67.0
Consolidated total assets | 2,312.1 |  |  |  | 2,292.1 |  |  |  | 2,312.1 | 2,292.1 |
Performance Engineered Products | Operating |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated net sales |  |  |  |  |  |  |  |  | 429.7 | 366.6 | 358.7
Consolidated operating income |  |  |  |  |  |  |  |  | 26.1 | 8.5 | (5.5)
Consolidated depreciation and amortization |  |  |  |  |  |  |  |  | 20.2 | 20.6 | 21.9
Consolidated capital expenditures |  |  |  |  |  |  |  |  | 31.6 | 17.0 | $ 19.8
Consolidated total assets | $ 513.6 |  |  |  | $ 434.3 |  |  |  | $ 513.6 | $ 434.3 |

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