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Goodwill and Other Intangible Assets - Goodwill Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  | $ 126,840,000 |  |  |
Goodwill |  | 303,970,000 |  | $ 334,640,000 | $ 316,650,000
Aerospace [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  | 126,840,000 |  |  |
Goodwill |  | 62,850,000 |  | $ 133,690,000 | $ 146,430,000
Aerospace Fasteners Reporting Unit [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 62,900,000 |  |  |  |
Aerospace Engineered Products Reporting Unit [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  | $ 0 | $ 12,700,000 |  |
Goodwill [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Change in discount rate | 1.00% |  |  |  |
Change in goodwill impairment due to change in discount rate | $ 20,000,000 |  |  |  |
Change in terminal growth rate | 0.50% |  |  |  |
Change in goodwill impairment due to change in terminal rate | $ 5,000,000 |  |  |  |
Goodwill [Member] | Aerospace Fasteners Reporting Unit [Member] | Aerospace [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Impairment Loss | 70,800,000 |  |  |  |
Goodwill [Member] | Aerospace Engineered Products Reporting Unit [Member] | Aerospace [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Impairment Loss | $ 56,000,000.0 |  |  |  |

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