Segments (Schedule of Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Net sales:
Net sales	$ 377.3	$ 343.3	$ 752.0	$ 661.1
Income before income taxes:
Total segment operating income	25.6	26.1	49.9	48.3
Interest expense	(6.9)	(6.6)	(13.7)	(12.9)
Income before income taxes	18.7	19.5	36.2	35.4
Identifiable assets:
Identifiable assets	998.6		998.6		$ 974.2
Operating Segments [Member]
Net sales:
Net sales	377.3	343.3	752.0	661.1
Income before income taxes:
Total segment operating income	31.8	33.3	62.8	62.1
Operating Segments [Member] | Supply Technologies [Member]
Net sales:
Net sales	150.2	142.4	301.6	276.8
Income before income taxes:
Total segment operating income	13.0	10.4	27.2	20.5
Identifiable assets:
Identifiable assets	288.7		288.7		277.6
Operating Segments [Member] | Assembly Components [Member]
Net sales:
Net sales	139.8	122.0	280.3	230.1
Income before income taxes:
Total segment operating income	13.6	12.2	24.2	20.3
Identifiable assets:
Identifiable assets	347.7		347.7		340.5
Operating Segments [Member] | Engineered Products [Member]
Net sales:
Net sales	87.3	78.9	170.1	154.2
Income before income taxes:
Total segment operating income	5.2	10.7	11.4	21.3
Identifiable assets:
Identifiable assets	248.3		248.3		246.9
Segment Reconciling Items [Member]
Income before income taxes:
Corporate costs	(6.2)	(7.2)	(12.9)	(13.8)
Interest expense	(6.9)	$ (6.6)	(13.7)	$ (12.9)
General corporate [Member]
Identifiable assets:
Identifiable assets	$ 113.9		$ 113.9		$ 109.2