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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 ($)
employee
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
employee
Dec. 31, 2015
USD ($)
Restructuring Cost and Reserve [Line Items]                
Restructuring charges           $ 0.0 $ 527.2 $ 64.3
Revision of estimates           0.1 (0.4)  
Restructuring and other charges           0.0 538.5 89.7
Restructuring Reserve [Roll Forward]                
Beginning balance       $ 8.1   33.1 8.1  
Additions             48.8  
Reversals           (2.7)    
Payments           (28.8) (23.8)  
Ending balance $ 8.1 $ 33.1     $ 8.1 1.6 33.1 8.1
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
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 Reserve [Roll Forward]                
Additions     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          
Restructuring Reserve [Roll Forward]                
Beginning balance       3.6   19.2 3.6  
Additions   15.4 16.3       28.0  
Reversals           (1.1)    
Payments           (17.3) (12.4)  
Ending balance 3.6 19.2     3.6 0.8 19.2 3.6
Employee benefit costs [Member]                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges             24.2  
Restructuring costs net of tax   8.6            
Restructuring Reserve [Roll Forward]                
Beginning balance       4.5   13.9 4.5  
Additions   13.2         20.8  
Reversals           (1.6)    
Payments           (11.5) (11.4)  
Ending balance 4.5 13.9     4.5 $ 0.8 $ 13.9 $ 4.5
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 Reserve [Roll Forward]                
Additions       $ 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