GOODWILL AND OTHER ACQUISITION INTANGIBLES (Activity In Goodwill Balances For Each Segment) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Goodwill [Line Items]
Goodwill, beginning balance	$ 508.8
Foreign currency translation adjustments	(6.8)
Goodwill, ending balance	502.0
Aerospace Materials
Goodwill [Line Items]
Goodwill, beginning balance	233.7
Foreign currency translation adjustments	(2.4)
Goodwill, ending balance	231.3
Industrial Materials
Goodwill [Line Items]
Goodwill, beginning balance	182.2
Foreign currency translation adjustments	(1.9)
Goodwill, ending balance	180.3
In Process Separation
Goodwill [Line Items]
Goodwill, beginning balance	65.1
Foreign currency translation adjustments	(2.5)
Goodwill, ending balance	62.6
Additive Technologies
Goodwill [Line Items]
Goodwill, beginning balance	27.8
Foreign currency translation adjustments	0.0
Goodwill, ending balance	$ 27.8