Goodwill and Other Intangible Assets - Goodwill (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Aug. 13, 2021 USD ($)	Mar. 31, 2020 USD ($)
Goodwill [Line Items]
Goodwill		$ 227,200,000	$ 227,900,000
Impairment of goodwill		0	0	$ (287,000,000)
Accumulated goodwill impairment	$ 528,000,000	$ 528,000,000	528,000,000	$ 528,000,000
Flowform Products
Goodwill [Line Items]
Goodwill					$ 12,200,000
Weighted average cost of capital | Fair Value, Inputs, Level 3 [Member]
Goodwill [Line Items]
Goodwill, fair value measurement input		0.117
Long-term growth rate | Fair Value, Inputs, Level 3 [Member] | Minimum
Goodwill [Line Items]
Goodwill, fair value measurement input		0.03
Long-term growth rate | Fair Value, Inputs, Level 3 [Member] | Maximum
Goodwill [Line Items]
Goodwill, fair value measurement input		0.035
High Performance Materials & Components
Goodwill [Line Items]
Goodwill		$ 227,200,000
Impairment of goodwill	$ 0	0	$ 0
Goodwill, Foreign Currency Translation Gain (Loss)		700,000
Forged Products
Goodwill [Line Items]
Goodwill		$ 161,200,000				$ 460,400,000
Percentage of fair value in excess of carrying value		50.00%
Specialty Materials [Member]
Goodwill [Line Items]
Goodwill		$ 66,000,000