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Selected Quarterly Financial Data (Unaudited) - Narrative (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2013 | Nov. 04, 2013 Tungsten Materials Business [Member] | Dec. 31, 2013 Iron Castings and Fabricated Components Businesses [Member] | Sep. 30, 2013 Iron Castings and Fabricated Components Businesses [Member] | Dec. 31, 2013 Iron Castings and Fabricated Components Businesses [Member] | Dec. 31, 2012 Iron Castings Business [Member] | Dec. 31, 2012 Iron Castings Business [Member] Fourth Quarter [Member]
Unusual Or Infrequent Item [Line Items] |  |  |  |  |  |  |  |
Gain on disposed operation net of tax |  |  | $ 261.4 |  |  |  |  |
Restructuring costs, net of tax | $ 41.2 | $ 41.2 |  | $ 6.1 | $ 5.8 | $ 11.9 | $ 8.8 | $ 8.8

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