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Business Segments (Details3) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Asset Reconciling Item [Line Items]
Identifiable Assets	$ 5,751.7	$ 6,571.7	$ 6,885.0
High Performance Materials & Components [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Identifiable Assets	3,355.5	3,555.8	3,452.2
Flat Rolled Products [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Identifiable Assets	2,189.5	2,601.6	2,320.9
Discontinued Operations [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Identifiable Assets	0.9	1.8	9.8
Corporate Prepaid Pension Cost [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Identifiable Assets	0.0	0.0	5.1
Corporate: Cash and cash equivalents and other [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Identifiable Assets	$ 205.8	$ 412.5	$ 1,097.0

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.18)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 12
-Article 7

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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