GOODWILL AND OTHER ACQUISITION INTANGIBLES (Activity in Goodwill Balances for Each Segment) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]
Beginning Balance	$ 525.3	$ 314.5
Acquisitions		205.2
Foreign currency translation adjustments	(2.5)	5.6
Umeco acquisition adjustments	2.3
Sale of the Industrial Materials distribution product line	(3.8)
Ending Balance	521.3	525.3
Aerospace Materials
Goodwill [Roll Forward]
Beginning Balance	237.1	219.5
Acquisitions		17.0
Foreign currency translation adjustments	1.1	0.6
Umeco acquisition adjustments	0.3
Sale of the Industrial Materials distribution product line	0
Ending Balance	238.5	237.1
Industrial Materials
Goodwill [Roll Forward]
Beginning Balance	186.8	14.5
Acquisitions		167.4
Foreign currency translation adjustments	1.1	4.9
Umeco acquisition adjustments	2.0
Sale of the Industrial Materials distribution product line	(3.8)
Ending Balance	186.1	186.8
In-Process Separation
Goodwill [Roll Forward]
Beginning Balance	73.6	52.7
Acquisitions		20.8
Foreign currency translation adjustments	(4.7)	0.1
Sale of the Industrial Materials distribution product line	0
Ending Balance	68.9	73.6
Additive Technologies
Goodwill [Roll Forward]
Beginning Balance	27.8	27.8
Acquisitions		0
Sale of the Industrial Materials distribution product line	0
Ending Balance	$ 27.8	$ 27.8