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Discontinued Operations - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nov. 04, 2013
Tungsten Materials Business [Member]
Dec. 31, 2013
Fabricated Components Business [Member]
Dec. 31, 2013
Iron Castings Business [Member]
Dec. 31, 2012
Iron Castings 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, 2013
Minimum [Member]
Fabricated Components 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 $ 0 $ 0 $ 600.9              
Gain on disposed operation, pre-tax         428.3              
Gain on disposed operation net of tax         261.4              
Restructuring costs           8.1 11.3 13.0     19.5  
Long-lived asset impairment           7.3            
Lease exit costs           0.8            
Lease exit costs, expected cash requirements                       4
Expected restructuring costs           4 years            
Restructuring costs, net of tax $ 41.2 $ 41.2           $ 8.8 $ 6.1 $ 5.8 $ 11.9