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Stockholders' Equity (Details)
1 Months Ended 12 Months Ended
Nov. 07, 2017
$ / shares
shares
Feb. 28, 2019
shares
Feb. 28, 2018
shares
Feb. 28, 2017
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
shares
Dec. 31, 2014
shares
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                      
Preferred stock, issued           0 0        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares issued 17,000,000                    
Price per share of shares issued (in dollars per share) | $ / shares $ 24.00                    
Issuance of common stock | $           $ 0 $ 0 $ 397,800,000      
Granted (shares)           396,000 290,000 378,000      
Common stock shares available for future awards           4,100,000          
Shares vested           681,000 540,000 591,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Nonvested beginning of the year (shares)         756,000 1,055,000 1,320,000 1,852,000      
Granted (shares)           396,000 290,000 378,000      
Vested (shares)           (681,000) (540,000) (591,000)      
Forfeited (shares)           (14,000) (15,000) (319,000)      
Nonvested end of the year (shares)           756,000 1,055,000 1,320,000 1,852,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Beginning balance (in dollars per share) | $ / shares         $ 24,200,000 $ 28,300,000 $ 32,500,000 $ 51,500,000      
Granted (in dollars per share) | $ / shares           10,800,000 7,800,000 7,100,000      
Vested (in dollars per share) | $ / shares           (14,500,000) (11,700,000) (16,900,000)      
Forfeited (in dollars per share) | $ / shares           (400,000) (300,000) (9,200,000)      
Ending balance (in dollars per share) | $ / shares           $ 24,200,000 $ 28,300,000 $ 32,500,000 $ 51,500,000    
Retained Earnings Note Disclosure [Abstract]                      
Undistributed earnings of investees accounted for under equity method | $           $ 14,500,000          
Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Income target attainment measurement period           3 years          
Restricted stock and RSUs [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share based compensation expense | $           $ 9,800,000 $ 9,700,000 $ 9,800,000      
Unrecognized compensation expense | $           $ 5,900,000          
Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Forfeited (shares)           (48,598) (21,848) (67,521)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                      
Granted (in dollars per share) | $ / shares           $ 14,700,000 $ 12,900,000 $ 12,400,000      
Forfeited (in dollars per share) | $ / shares           $ (1,100,000) $ (500,000) $ (1,000,000.0)      
2016 LTIP [Member] | Restricted Share Units [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares vested   175,287 178,335 190,421              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Vested (shares)   (175,287) (178,335) (190,421)              
2017 RSU [Member] | Restricted Share Units [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (shares)               320,808      
Shares vested   102,188 102,279                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Granted (shares)               320,808      
Vested (shares)   (102,188) (102,279)                
2018 RSU [Member] | Restricted Share Units [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (shares)             253,393        
Shares vested   83,312                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Granted (shares)             253,393        
Vested (shares)   (83,312)                  
2019 RSU [Member] | Restricted Share Units [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (shares)           345,400          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Granted (shares)           345,400          
Long-Term Shareholder Value (LTSV) 2015 [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Percent of performance metric expected to be obtained               60.00%      
Shares vested               73,734      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Vested (shares)               (73,734)      
Forfeited (shares)               (49,148)      
Long-Term Shareholder Value (LTSV) 2015 [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Income target attainment measurement period           3 years          
PRSP 2012 [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares vested       166,929              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Vested (shares)       (166,929)              
Forfeited (shares)                     (171,083)
PRSP 2013 [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares vested     233,896                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Vested (shares)     (233,896)                
Forfeited (shares)                   (244,899)  
PRSP 2014 [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares vested   207,751                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Vested (shares)   (207,751)                  
Forfeited (shares)                 (214,571)    
PRSP 2015 [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares vested               126,585      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Vested (shares)               (126,585)      
Forfeited (shares)               (196,196)      
PSU [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Adjustment percentage           20.00% 20.00%        
PSU [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Performance measurement period           3 years          
Share based compensation expense | $           $ 14,600,000 $ 11,400,000 $ 3,800,000      
Common stock shares available for future awards           1,800,000          
Unrecognized compensation expense | $           $ 12,900,000          
TSR Modifier [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Performance measurement period             3 years        
TSR and TSRP Awards [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share based compensation expense | $               $ 3,600,000      
2016 PSU [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares vested             329,897        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Vested (shares)             (329,897)        
2017 PSU [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (shares)               589,980      
Shares vested           669,898          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Granted (shares)               589,980      
Vested (shares)           (669,898)          
2018 PSU [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (shares)             456,318        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Granted (shares)             456,318        
2019 PSU [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (shares)           479,364          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                      
Granted (shares)           479,364          
Minimum | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period           3 years          
Minimum | PSU [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Expected compensation cost | $           $ 0          
Minimum | TSR and TSRP Awards [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award multiplier               0      
Minimum | 2017 PSU [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Attainment level range (percent)           25.00%          
Minimum | 2018 and 2019 PSU [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Attainment level range (percent)           25.00%          
Maximum | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period           5 years          
Maximum | PSU [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Expected compensation cost | $           $ 51,000,000          
Maximum | TSR and TSRP Awards [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award multiplier               2      
Maximum | 2017 PSU [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Attainment level range (percent)           150.00%          
Maximum | 2018 and 2019 PSU [Member] | Performance Awards [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Attainment level range (percent)           200.00%          
Forecast [Member] | Restricted stock and RSUs [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share based compensation expense | $         $ 4,600,000            
Forecast [Member] | PSU [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share based compensation expense | $         $ 7,700,000            
Domestic Bank Group $500 million asset-based credit facility [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Debt instrument carrying amount | $           $ 0 $ 0        
Allegheny Technologies $350 million 9.375% Senior Notes due 2019                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Debt instrument carrying amount | $                 $ 350,000,000    
Debt instrument interest rate stated percentage                 9.375%    
Revolving Credit Facility [Member] | Domestic Bank Group $500 million asset-based credit facility [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Debt covenant, line of credit facility remaining borrowing capacity after dividends, upper threshold | $           $ 150,000,000          
Debt covenant, line of credit facility remaining borrowing capacity after dividends as percent of maximum borrowing capacity, upper threshold           30.00%          
Debt covenant, line of credit facility remaining borrowing capacity after dividends, lower threshold | $           $ 75,000,000          
Debt covenant, line of credit facility remaining borrowing capacity after dividends as percent of maximum borrowing capacity, lower threshold           15.00%          
Fixed charge coverage ratio           1.00