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Restructuring Costs (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
employee
Dec. 31, 2016
USD ($)
employee
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Restructuring Cost and Reserve [Line Items]                
Restructuring charges           $ 527.2 $ 64.3 $ 0.0
Revision of estimates           (0.4) (0.2)  
Restructuring reserve $ 8.1 $ 33.1     $ 8.1 33.1 8.1  
Restructuring costs           48.8    
Restructuring and other charges           538.5 89.7 0.0
Payments for Restructuring           (23.8)    
Inventory Valuation Reserve [Member] | Non-PQ grade titanium sponge [Member]                
Restructuring Cost and Reserve [Line Items]                
Inventory valuation charges             25.4  
Inventory Valuation Reserve [Member] | Industrial titanium products [Member]                
Restructuring Cost and Reserve [Line Items]                
Inventory valuation charges           17.7 24.5 $ 23.2
Long-Lived Asset Impairment [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges           471.3    
Restructuring costs net of tax     $ 310.3          
Asset Impairment Charges             54.5  
Restructuring costs     471.3          
Facility Closing [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges         3.5 31.7    
Restructuring costs net of tax   10.0 10.7   2.2      
Restructuring reserve 3.6 19.2     3.6 19.2 3.6  
Restructuring costs   15.4 16.3     28.0    
Payments for Restructuring           (12.4)    
Employee benefit costs [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges           24.2    
Restructuring costs net of tax   8.6            
Restructuring reserve 4.5 13.9     4.5 13.9 $ 4.5  
Restructuring costs   13.2       20.8    
Payments for Restructuring           $ (11.4)    
Flat Rolled Products [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and Related Cost, Expected Number of Positions Eliminated | employee           250    
Flat Rolled Products [Member] | Facility Closing [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges           $ 8.4    
Flat Rolled Products [Member] | Employee benefit costs [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges           4.9    
Flat Rolled Products [Member] | Special Termination Benefits [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges           3.4    
Flat Rolled Products [Member] | Employee Severance [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges           $ 11.8    
Restructuring costs net of tax       $ 6.7        
Restructuring costs       $ 9.0        
High Performance Materials & Components and Corporate [Member]                
Restructuring Cost and Reserve [Line Items]                
Severance and termination benefit costs         $ 6.3      
Number of employees affected by restructuring | employee         100      
High Performance Materials & Components [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring and Related Cost, Expected Number of Positions Eliminated | employee           180    
High Performance Materials & Components [Member] | Facility Closing [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges           $ 23.8    
High Performance Materials & Components [Member] | Employee benefit costs [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges           7.5    
Rowley, UT facility [Member]                
Restructuring Cost and Reserve [Line Items]                
Asset Impairment Charges     $ 470.8          
Estimated fair value after impairment   $ 15.0       $ 15.0    
Midland, Pennsylvania Facility [Member] | Flat Rolled Products [Member]                
Restructuring Cost and Reserve [Line Items]                
Asset Impairment Charges 24.2              
Grain-Oriented Electrical Steel (GOES) Operations in Western Pennsylvania [Member] | Flat Rolled Products [Member]                
Restructuring Cost and Reserve [Line Items]                
Asset Impairment Charges $ 30.3