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Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 295,800,000 | $ 286,900,000 | $ 378,700,000 | $ 541,000,000.0 | $ 564,300,000 | $ 572,500,000 | $ 609,000,000.0 | $ 609,900,000 | $ 1,502,400,000 | $ 2,355,700,000 | $ 2,189,100,000
Operating income (loss) | (20,400,000) | $ (37,600,000) | $ 6,400,000 | $ 65,700,000 | 97,400,000 | $ 109,900,000 | $ 115,100,000 | $ 102,800,000 | 14,100,000 | 425,200,000 | 371,200,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 140,900,000 | 141,700,000 | 123,100,000
Equity in earnings from affiliated companies |  |  |  |  |  |  |  |  | (1,600,000) | 3,700,000 | 5,600,000
Other operating expense |  |  |  |  |  |  |  |  | 57,900,000 | 0 | 7,700,000
Segment assets | 2,917,800,000 |  |  |  | 3,128,600,000 |  |  |  | 2,917,800,000 | 3,128,600,000 | 2,824,100,000
Investments in affiliated companies | 44,700,000 |  |  |  | 46,500,000 |  |  |  | 44,700,000 | 46,500,000 | 48,700,000
Accrual basis additions to property, plant and equipment |  |  |  |  |  |  |  |  | 42,500,000 | 191,000,000.0 | 179,100,000
Corporate & Other and Intersegment Elimination |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (56,400,000) | (84,200,000) | (74,700,000)
Operating income (loss) |  |  |  |  |  |  |  |  | (56,000,000.0) | (58,100,000) | (53,200,000)
Depreciation and amortization |  |  |  |  |  |  |  |  | 100,000 | 100,000 | 100,000
Equity in earnings from affiliated companies |  |  |  |  |  |  |  |  | (200,000) | (300,000) |
Other operating expense |  |  |  |  |  |  |  |  | 16,000,000.0 |  |
Segment assets | 61,700,000 |  |  |  | (6,200,000) |  |  |  | 61,700,000 | (6,200,000) | 49,300,000
Investments in affiliated companies | 7,700,000 |  |  |  | 8,200,000 |  |  |  | 7,700,000 | 8,200,000 | 14,200,000
Composite Materials |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,185,900,000 | 1,863,100,000 | 1,770,500,000
Composite Materials | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 60,700,000 | 411,300,000 | 373,800,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 125,500,000 | 126,500,000 | 113,900,000
Equity in earnings from affiliated companies |  |  |  |  |  |  |  |  | (300,000) | (300,000) |
Other operating expense |  |  |  |  |  |  |  |  | 32,100,000 |  |
Segment assets | 2,382,300,000 |  |  |  | 2,669,600,000 |  |  |  | 2,382,300,000 | 2,669,600,000 | 2,501,900,000
Investments in affiliated companies | 2,000,000.0 |  |  |  | 2,200,000 |  |  |  | 2,000,000.0 | 2,200,000 | 2,400,000
Accrual basis additions to property, plant and equipment |  |  |  |  |  |  |  |  | 38,600,000 | 185,800,000 | 173,500,000
Composite Materials | Intersegment Elimination |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 53,900,000 | 83,400,000 | 74,600,000
Engineered Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 316,500,000 | 492,600,000 | 418,600,000
Engineered Products | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 9,400,000 | 72,000,000.0 | 50,600,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 15,300,000 | 15,100,000 | 9,100,000
Equity in earnings from affiliated companies |  |  |  |  |  |  |  |  | (1,100,000) | 4,300,000 | 5,600,000
Other operating expense |  |  |  |  |  |  |  |  | 9,800,000 |  | 7,700,000
Segment assets | 473,800,000 |  |  |  | 465,200,000 |  |  |  | 473,800,000 | 465,200,000 | 272,900,000
Investments in affiliated companies | $ 35,000,000.0 |  |  |  | $ 36,100,000 |  |  |  | 35,000,000.0 | 36,100,000 | 32,100,000
Accrual basis additions to property, plant and equipment |  |  |  |  |  |  |  |  | 3,900,000 | 5,200,000 | 5,600,000
Engineered Products | Intersegment Elimination |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 2,500,000 | $ 800,000 | $ 100,000

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