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Business Segments (Details8) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |
Inventory valuation reserves |  | $ 121,500,000 |  | $ 88,500,000 | $ 121,500,000 |
Segment Operating Profit Loss |  |  |  | 413,200,000 | 283,400,000 | $ 5,700,000
LIFO and net realizable value reserves |  |  |  | (700,000) | (200,000) | 800,000
Corporate expenses |  |  |  | (58,100,000) | (50,500,000) | (43,400,000)
Closed operations and other expenses |  |  |  | (21,600,000) | (34,000,000) | (34,600,000)
Restructuring and other charges |  |  |  | 0 | 0 | (538,500,000)
Impairment of goodwill |  |  | $ (114,400,000) | 0 | (114,400,000) | 0
Debt extinguishment charge |  | $ (37,000,000) |  | 0 | (37,000,000) | 0
Gain on joint venture deconsolidation | $ 15,900,000 |  |  | 15,900,000 | 0 | 0
Interest expense, net |  |  |  | (101,000,000) | (133,800,000) | (124,000,000)
Income (loss) before income taxes |  |  |  | 247,700,000 | (86,500,000) | (734,000,000)
High Performance Materials & Components |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |
Impairment of goodwill |  |  |  | 0 | (114,400,000) | 0
Operating Segments | High Performance Materials & Components |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |
Segment Operating Profit Loss |  |  |  | 335,400,000 | 246,400,000 | 168,700,000
Operating Segments | Flat Rolled Products |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |
Segment Operating Profit Loss |  |  |  | $ 77,800,000 | $ 37,000,000 | $ (163,000,000)

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- Definition Business segment operating profit, which excludes costs for restructuring charges, retirement benefit income or expense, corproate expenses, interest expense, debt extinguishment costs and costs associated with closed operations. These costs are excluded for segment reporting to provide a profit measure based on what management considers to be controllable costs at the business segment level + References No definition available. + Details
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