Segments (Schedule of Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net sales:
Net sales	$ 379.5	$ 403.4	$ 415.3	$ 420.1	$ 405.9	$ 414.3	$ 432.2	$ 405.7	$ 1,618.3	$ 1,658.1	$ 1,412.9
Segment operating income:
Total segment operating income									83.1	97.3	83.8
Gain on sale of assets							$ 1.9		0.0	1.9	0.0
Litigation settlement gain									0.0	0.0	3.3
Other components of pension income and other postretirement benefits expense, net									5.6	8.8	6.4
Interest expense, net									(33.8)	(34.3)	(31.5)
Loss on extinguishment of debt									0.0	0.0	(11.0)
Income before income taxes									54.9	71.8	47.7
Capital expenditures									40.1	45.1	27.9
Depreciation and amortization expense									34.2	36.3	31.5
Identifiable assets	1,310.4				1,208.5				1,310.4	1,208.5	1,132.5
Supply Technologies
Net sales:
Net sales									611.5	636.8	561.8
Assembly Components
Net sales:
Net sales									539.5	578.3	524.5
Engineered Products
Net sales:
Net sales									467.3	443.0	326.6
Operating Segments
Segment operating income:
Total segment operating income									115.9	130.3	110.6
Capital expenditures									40.1	45.1	27.9
Depreciation and amortization expense									34.2	36.3	31.5
Operating Segments | Supply Technologies
Segment operating income:
Total segment operating income									42.0	49.0	43.3
Capital expenditures									6.1	5.2	3.3
Depreciation and amortization expense									4.8	5.3	4.7
Identifiable assets	355.9				330.1				355.9	330.1	344.4
Operating Segments | Assembly Components
Segment operating income:
Total segment operating income									36.2	42.9	47.8
Capital expenditures									19.5	24.3	18.6
Depreciation and amortization expense									20.1	22.2	20.7
Identifiable assets	413.4				378.3				413.4	378.3	351.4
Operating Segments | Engineered Products
Segment operating income:
Total segment operating income									37.7	38.4	19.5
Capital expenditures									14.3	15.4	5.7
Depreciation and amortization expense									8.8	8.4	5.6
Identifiable assets	455.1				433.1				455.1	433.1	353.6
Corporate
Segment operating income:
Corporate costs									(28.5)	(34.9)	(30.1)
Capital expenditures									0.2	0.2	0.3
Depreciation and amortization expense									0.5	0.4	0.5
Identifiable assets	$ 86.0				$ 67.0				86.0	67.0	83.1
Segment Reconciling Items
Segment operating income:
One-time net expense related to former President									(4.3)	0.0	0.0
Gain on sale of assets									0.0	1.9	0.0
Litigation settlement gain									$ 0.0	$ 0.0	$ 3.3