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Selected Quarterly Financial Data (Unaudited) - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Unusual Or Infrequent Item [Line Items]                  
Restructuring costs             $ 48.8    
Income taxes (above) below normal $ (32.4)   $ (11.4) $ 12.0          
Federal tax rate             35.00%    
NRV charge         $ 51.2 $ 76.0 $ (39.9) $ 131.5 $ (25.0)
NRV charge net of tax         32.0 49.5      
Deferred tax asset valuation allowance charge (22.5) $ 173.1       $ 63.9      
Impairment of goodwill             0.0 126.6 $ 0.0
Impairment of Long-Lived Assets Held-for-use, After Tax         34.1        
Flat Rolled Products [Member]                  
Unusual Or Infrequent Item [Line Items]                  
Impairment of goodwill         126.6        
Impairment of goodwill net of tax         79.2        
High Performance Materials & Components and Corporate [Member]                  
Unusual Or Infrequent Item [Line Items]                  
Severance and termination benefit costs         6.3        
Severance and termination benefit costs net of tax         3.9        
Employee Severance [Member] | Flat Rolled Products [Member]                  
Unusual Or Infrequent Item [Line Items]                  
Restructuring costs       9.0          
Restructuring costs net of tax       6.7          
Work Stoppage and Return to Work [Member] | Flat Rolled Products [Member]                  
Unusual Or Infrequent Item [Line Items]                  
Restructuring costs     22.4 26.4          
Restructuring costs net of tax     $ 8.4 $ 19.7          
Long-Lived Asset Impairment [Member]                  
Unusual Or Infrequent Item [Line Items]                  
Restructuring costs   471.3              
Restructuring costs net of tax   310.3              
Asset Impairment Charges               54.5  
Facility Closing [Member]                  
Unusual Or Infrequent Item [Line Items]                  
Restructuring costs 15.4 16.3         28.0    
Restructuring costs net of tax 10.0 10.7     2.2        
Employee benefit costs [Member]                  
Unusual Or Infrequent Item [Line Items]                  
Restructuring costs 13.2           20.8    
Restructuring costs net of tax $ 8.6                
Inventory Valuation Reserve [Member] | Titanium Sponge Inventory [Member]                  
Unusual Or Infrequent Item [Line Items]                  
Inventory valuation charges   11.3         $ 11.3    
Inventory valuation charges net of tax   $ 7.4              
Inventory Valuation Reserve [Member] | Non-PQ grade titanium sponge [Member]                  
Unusual Or Infrequent Item [Line Items]                  
Inventory valuation charges               $ 25.4  
Inventory valuation charges net of tax         $ 15.9