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Summary of Significant Accounting Policies - Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Disposal Group, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 915.3 | $ 972.4 | $ 1,056.8 | $ 1,099.0 | $ 1,021.4 | $ 1,131.5 | $ 1,260.2 | $ 1,253.8 | $ 4,043.5 | $ 4,666.9 | $ 4,812.3
Tungsten Materials Business [Member] |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash received in sale of business |  |  |  |  |  |  |  |  | $ 605 |  |
Former Engineered Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of total revenue |  |  |  |  |  |  |  |  | 3.00% |  |

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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + 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 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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