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Business Segments (Details2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	$ 170.3	$ 189.9	$ 176.8
Capital expenditures	202.2	144.5	225.7
Operating Segments [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	170.3	189.9	176.6
Capital expenditures	202.2	144.5	225.7
Operating Segments [Member] | High Performance Materials & Components [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	118.4	131.8	124.4
Capital expenditures	89.9	75.8	51.9
Operating Segments [Member] | Flat Rolled Products [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	48.8	55.6	49.3
Capital expenditures	111.8	68.0	172.1
Operating Segments [Member] | Corporate [Member]
Segment Reporting Other Significant Reconciling Item [Line Items]
Depreciation and amortization	3.1	2.5	2.9
Capital expenditures	$ 0.5	$ 0.7	$ 1.7

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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X

- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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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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