Segments (Schedule of Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Net sales:
Net sales	$ 352.2		$ 312.7		$ 1,046.9	$ 970.1
Segment operating income:
Total segment operating income	20.7		20.9		67.0	52.5
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	(7.8)		(7.2)		(23.1)	(21.3)
Loss on extinguishment of debt	0.0		0.0		(11.0)	0.0
Income before income taxes	12.9		13.7		32.9	31.2
Operating Segments
Net sales:
Net sales	352.2		312.7		1,046.9	970.1
Segment operating income:
Total segment operating income	28.3		27.6		85.1	77.7
Operating Segments | Supply Technologies
Net sales:
Net sales	140.2		122.0		415.8	384.8
Segment operating income:
Total segment operating income	10.9		9.7		34.6	30.8
Operating Segments | Assembly Components
Net sales:
Net sales	127.9		133.4		393.2	399.4
Segment operating income:
Total segment operating income	11.4		13.9		37.0	38.3
Operating Segments | Engineered Products
Net sales:
Net sales	84.1		57.3		237.9	185.9
Segment operating income:
Total segment operating income	6.0		4.0		13.5	8.6
Segment Reconciling Items
Segment operating income:
Total segment operating income	20.7		20.9		67.0	52.5
Corporate costs	(7.6)		(6.7)		(21.4)	(21.2)
Litigation settlement gain	0.0		0.0		3.3	0.0
Asset impairment charge	0.0		0.0		0.0	(4.0)
Interest expense	(7.8)		(7.2)		(23.1)	(21.3)
Loss on extinguishment of debt	$ 0.0		$ 0.0		$ (11.0)	$ 0.0