Goodwill (Change in Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 86.6	$ 82.0	$ 89.5
Acquisitions	9.9	6.1	(6.2)
Foreign currency translation	3.7	(1.5)	(1.3)
Goodwill, end of period	100.2	86.6	82.0
Supply Technologies
Goodwill [Roll Forward]
Goodwill, beginning of period	6.1	7.2	7.6
Acquisitions	8.4	0.0	0.0
Foreign currency translation	0.9	(1.1)	(0.4)
Goodwill, end of period	15.4	6.1	7.2
Assembly Components
Goodwill [Roll Forward]
Goodwill, beginning of period	54.1	54.1	54.0
Acquisitions	0.0	0.0	0.1
Foreign currency translation	0.0	0.0	0.0
Goodwill, end of period	54.1	54.1	54.1
Engineered Products
Goodwill [Roll Forward]
Goodwill, beginning of period	26.4	20.7	27.9
Acquisitions	1.5	6.1	(6.3)
Foreign currency translation	2.8	(0.4)	(0.9)
Goodwill, end of period	$ 30.7	$ 26.4	$ 20.7