Segments (Schedule of Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net sales:
Total revenues	$ 350.0	$ 228.3	$ 709.6	$ 594.6
Segment operating income (loss):
Total segment operating income (loss)	(3.4)	(20.9)	8.9	(7.9)
Other components of pension income and other postretirement benefits expense, net	2.5	1.8	4.9	3.6
Interest expense, net	(7.4)	(7.5)	(14.8)	(15.5)
Loss before income taxes	(8.3)	(26.6)	(1.0)	(19.8)
Operating Segments
Segment operating income (loss):
Total segment operating income (loss)	3.4	(15.1)	20.9	4.2
Segment Reconciling Items
Segment operating income (loss):
Corporate costs	(6.8)	(5.8)	(12.0)	(12.1)
Supply Technologies
Net sales:
Total revenues	155.0	94.4	312.7	235.2
Supply Technologies | Operating Segments
Segment operating income (loss):
Total segment operating income (loss)	10.2	0.3	22.5	9.5
Assembly Components Segment
Net sales:
Total revenues	109.5	54.9	235.5	183.1
Assembly Components Segment | Operating Segments
Segment operating income (loss):
Total segment operating income (loss)	(6.1)	(14.6)	0.3	(8.3)
Engineered Products Segment
Net sales:
Total revenues	85.5	79.0	161.4	176.3
Engineered Products Segment | Operating Segments
Segment operating income (loss):
Total segment operating income (loss)	$ (0.7)	$ (0.8)	$ (1.9)	$ 3.0