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Business Segments (Details8) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |
Inventory valuation reserves | $ 104,100,000 |  | $ 104,100,000 | $ 88,500,000 |
Segment Operating Profit Loss |  |  | 380,700,000 | 413,200,000 | $ 283,400,000
LIFO and net realizable value reserves |  |  | (100,000) | (700,000) | (200,000)
Corporate expenses |  |  | (66,800,000) | (58,100,000) | (50,500,000)
Closed operations and other expenses |  |  | (25,500,000) | (21,600,000) | (34,000,000.0)
Restructuring and other charges | (4,500,000) |  | (4,500,000) | 0 | 0
Impairment of goodwill |  |  | 0 | 0 | (114,400,000)
Debt extinguishment charge | (21,600,000) |  | (21,600,000) | 0 | (37,000,000.0)
Gain on joint venture deconsolidation |  | $ 15,900,000 | 0 | 15,900,000 | 0
Non-cash joint venture impairment charge | $ (11,400,000) |  | (11,400,000) | 0 | 0
Gain on asset sales, net |  |  | 89,800,000 | 0 | 0
Interest expense, net |  |  | (99,000,000.0) | (101,000,000.0) | (133,800,000)
Income (loss) before income taxes |  |  | 241,600,000 | 247,700,000 | (86,500,000)
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)
Operating Segments | High Performance Materials & Components |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |
Segment Operating Profit Loss |  |  | 343,100,000 | 335,400,000 | 246,400,000
Operating Segments | Flat Rolled Products |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |
Segment Operating Profit Loss |  |  | $ 37,600,000 | $ 77,800,000 | $ 37,000,000.0

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