Segments (Schedule of Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net sales:
Total revenues	$ 359.6	$ 366.3
Segment operating income (loss):
Total segment operating income	12.3	13.0
Other components of pension income and other postretirement benefits expense, net	2.4	1.8
Interest expense, net	(7.4)	(8.0)
Income before income taxes	7.3	6.8
Operating Segments
Segment operating income (loss):
Total segment operating income	17.3	19.3
Segment Reconciling Items
Segment operating income (loss):
Corporate costs	(5.0)	(6.3)
Supply Technologies
Net sales:
Total revenues	157.7	140.8
Supply Technologies | Operating Segments
Segment operating income (loss):
Total segment operating income	12.2	9.2
Assembly Components Segment
Net sales:
Total revenues	126.0	128.2
Assembly Components Segment | Operating Segments
Segment operating income (loss):
Total segment operating income	6.4	6.3
Engineered Products Segment
Net sales:
Total revenues	75.9	97.3
Engineered Products Segment | Operating Segments
Segment operating income (loss):
Total segment operating income	$ (1.3)	$ 3.8