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Discontinued Operations - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of business, net of transaction costs $ 0.0 $ 0.0 $ 600.9
Restructuring costs net of tax 41.6   41.2
Tungsten Materials Business [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of business, net of transaction costs     600.9
Gain on disposed operation, pre-tax     428.3
Gain on disposed operation net of tax     261.4
Iron Castings Business [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Restructuring Charge   1.8  
Cash exit costs paid $ 0.8 $ 1.0  
Iron Castings and Fabricated Components Businesses [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Restructuring Charge     19.5
Restructuring costs net of tax     11.9
Asset impairment charges     $ 18.6