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Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Acero Prime	Oct. 01, 2014 Subsequent event Acero Prime item	Oct. 01, 2014 Subsequent event Acero Prime
Subsequent Event
Ownership percentage in consolidated subsidiary							51.00%
Ownership percentage in equity method investment					40.00%
Number of locations with toll processing operations serving customers in the auto industry						3
Net sales	$ 2,705.1	$ 2,443.5	$ 7,874.9	$ 6,917.1	$ 23.0

X

- Definition

The percentage of ownership of common stock or equity participation in the consolidated subsidiary.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of locations with toll processing operations serving customers in the auto industry.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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