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