Goodwill and Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Change in the carrying amount of Goodwill
Beginning Balance	$ 332.7	$ 224.4
Acquisitions	7.1	108.8
Other	(0.9)	(0.5)
Ending Balance	338.9	332.7
Mobile Industries [Member]
Change in the carrying amount of Goodwill
Beginning Balance	16.9	0
Acquisitions	0.8	16.9
Other	0	0
Ending Balance	17.7	16.9
Process Industries [Member]
Change in the carrying amount of Goodwill
Beginning Balance	141.1	50.0
Acquisitions	6.3	91.9
Other	(1.0)	(0.8)
Ending Balance	146.4	141.1
Aerospace and Defense [Member]
Change in the carrying amount of Goodwill
Beginning Balance	162.1	162.3
Acquisitions	0	0
Other	0.1	(0.2)
Ending Balance	162.2	162.1
Steel [Member]
Change in the carrying amount of Goodwill
Beginning Balance	12.6	12.1
Acquisitions	0	0
Other	0	0.5
Ending Balance	$ 12.6	$ 12.6