Business Segment Information - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Schedule Of Assets By Segment
Number of operating segments | segment	3
Total third-party sales	$ 1,141.8	$ 1,074.0	$ 1,205.7
Automotive
Schedule Of Assets By Segment
Total third-party sales	63.5	58.1	88.5
Automotive | Scenario, Adjustment | Engineered Materials
Schedule Of Assets By Segment
Total third-party sales		(10.4)
Power Generation | Scenario, Adjustment | Engineered Materials
Schedule Of Assets By Segment
Total third-party sales		(12.6)
General industrial
Schedule Of Assets By Segment
Total third-party sales	302.7	251.8	264.8
General industrial | Scenario, Adjustment | Engineered Materials
Schedule Of Assets By Segment
Total third-party sales		15.9
Medium-duty/heavy-duty truck
Schedule Of Assets By Segment
Total third-party sales	183.9	248.5	$ 342.1
Medium-duty/heavy-duty truck | Scenario, Adjustment | Engineered Materials
Schedule Of Assets By Segment
Total third-party sales		6.7
Other Markets | Scenario, Adjustment | Engineered Materials
Schedule Of Assets By Segment
Total third-party sales		0.4
Customer One | Scenario, Adjustment
Schedule Of Assets By Segment
Total third-party sales	$ 164.6	$ 132.2