GOODWILL AND OTHER ACQUISITION INTANGIBLES (Activity in Goodwill Balances for Each Segment) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 521.3us-gaap_Goodwill	$ 525.3us-gaap_Goodwill
Foreign currency translation adjustments	(12.5)us-gaap_GoodwillTranslationAdjustments	(2.5)us-gaap_GoodwillTranslationAdjustments
Umeco acquisition adjustments		2.3
Sale of the Industrial Materials distribution product line		(3.8)
Goodwill, ending balance	508.8us-gaap_Goodwill	521.3us-gaap_Goodwill
Aerospace Materials
Goodwill [Roll Forward]
Goodwill, beginning balance	238.5	237.1
Foreign currency translation adjustments	(4.8)	1.1
Umeco acquisition adjustments		0.3
Goodwill, ending balance	233.7	238.5
Industrial Materials
Goodwill [Roll Forward]
Goodwill, beginning balance	186.1	186.8
Foreign currency translation adjustments	(3.9)	1.1
Umeco acquisition adjustments		2.0
Sale of the Industrial Materials distribution product line		(3.8)
Goodwill, ending balance	182.2	186.1
In-Process Separation
Goodwill [Roll Forward]
Goodwill, beginning balance	68.9	73.6
Foreign currency translation adjustments	(3.8)	(4.7)
Goodwill, ending balance	65.1	68.9
Additive Technologies
Goodwill [Roll Forward]
Goodwill, beginning balance			27.8
Goodwill, ending balance	$ 27.8	$ 27.8	$ 27.8

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460

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