Segments (Schedule of Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Net sales:
Net sales	$ 350.9		$ 329.4		$ 694.7	$ 657.4
Segment operating income:
Total segment operating income	24.1		20.3		46.3	31.6
Litigation settlement gain	0.0	$ (3.3)	0.0		(3.3)	0.0
Asset impairment charge	0.0		0.0	$ (4.0)	0.0	(4.0)
Interest expense	(7.9)		(7.0)		(15.3)	(14.1)
Loss on extinguishment of debt	(11.0)		0.0		(11.0)	0.0
Income before income taxes	5.2		13.3		20.0	17.5
Operating Segments
Net sales:
Net sales	350.9		329.4
Segment operating income:
Total segment operating income	31.3		28.3		56.8	50.1
Operating Segments | Supply Technologies
Net sales:
Net sales	142.4		132.9		275.6	262.8
Segment operating income:
Total segment operating income	12.4		10.9		23.7	21.1
Operating Segments | Assembly Components
Net sales:
Net sales	126.0		134.3		265.3	266.0
Segment operating income:
Total segment operating income	13.1		14.2		25.6	24.4
Operating Segments | Engineered Products
Net sales:
Net sales	82.5		62.2		153.8	128.6
Segment operating income:
Total segment operating income	5.8		3.2		7.5	4.6
Segment Reconciling Items
Segment operating income:
Total segment operating income	24.1		20.3		46.3	31.6
Corporate costs	(7.2)		(8.0)		(13.8)	(14.5)
Litigation settlement gain	0.0		0.0		3.3	0.0
Asset impairment charge	0.0		0.0		0.0	(4.0)
Interest expense	(7.9)		(7.0)		(15.3)	(14.1)
Loss on extinguishment of debt	$ (11.0)		$ 0.0		$ (11.0)	$ 0.0