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Stockholders' Equity (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Nov. 07, 2017
$ / shares
shares
Feb. 28, 2018
shares
Feb. 28, 2017
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
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 $ 397.8 $ 0.0    
Granted (shares)         290,000 378,000 682,000    
Common stock shares available for future awards         5,300,000        
Shares vested         540,000 591,000 154,000    
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)       1,055,000 1,320,000 1,852,000 1,652,000    
Granted (shares)         290,000 378,000 682,000    
Vested (shares)         (540,000) (591,000) (154,000)    
Forfeited (shares)         (15,000) (319,000) (328,000)    
Nonvested end of the year (shares)         1,055,000 1,320,000 1,852,000 1,652,000  
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       $ 28,300,000 $ 32,500,000 $ 51,500,000 $ 57,000,000    
Granted (in dollars per share) | $ / shares         7,800,000 7,100,000 8,400,000    
Vested (in dollars per share) | $ / shares         (11,700,000) (16,900,000) (4,300,000)    
Forfeited (in dollars per share) | $ / shares         (300,000) (9,200,000) (9,600,000)    
Ending balance (in dollars per share) | $ / shares         $ 28,300,000 $ 32,500,000 $ 51,500,000 $ 57,000,000  
Retained Earnings Note Disclosure [Abstract]                  
Undistributed earnings of investees accounted for under equity method | $         $ 24.0        
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 | $         $ 9.7 $ 9.8 $ 11.2    
Unrecognized compensation expense | $         $ 5.3        
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)         (21,848) (67,521) (17,598)    
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         $ 12,900,000 $ 12,400,000 $ 11,500,000    
Forfeited (in dollars per share) | $ / shares         $ (500,000) $ (1,000,000) $ (200,000)    
2016 LTIP [Member] | Restricted Share Units [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (shares)             587,661    
Shares vested   178,335 190,421            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                  
Granted (shares)             587,661    
Vested (shares)   (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   102,279              
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)   (102,279)              
2018 RSU [Member] | Restricted Share Units [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (shares)         253,393        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                  
Granted (shares)         253,393        
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]                  
Award vesting period           3 years      
Long-Term Shareholder Value (LTSV) 2014 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares vested             116,989    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                  
Vested (shares)             (116,989)    
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, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                  
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%        
PSU [Member] | Performance Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Income target attainment measurement period         3 years        
Performance measurement period         3 years        
Share based compensation expense | $         $ 11.4 $ 3.8 $ 1.9    
Common stock shares available for future awards         1,700,000        
Unrecognized compensation expense | $         $ 12.1        
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 | $           $ 3.6 $ 6.6    
2016 PSU [Member] | Performance Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (shares)             936,558    
Shares vested         329,897        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                  
Granted (shares)             936,558    
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      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                  
Granted (shares)           589,980      
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        
Minimum [Member] | Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period         3 years        
Minimum [Member] | PSU [Member] | Performance Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Expected compensation cost | $         $ 0.0        
Minimum [Member] | TSR and TSRP Awards [Member] | Performance Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award multiplier           0      
Minimum [Member] | 2018 PSU [Member] | Performance Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Attainment level range (percent)         25.00%        
Minimum [Member] | 2016 and 2017 PSU [Member] | Performance Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Attainment level range (percent)         25.00%        
Maximum [Member] | Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period         5 years        
Maximum [Member] | PSU [Member] | Performance Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Expected compensation cost | $         $ 34.8        
Maximum [Member] | TSR and TSRP Awards [Member] | Performance Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award multiplier           2      
Maximum [Member] | 2018 PSU [Member] | Performance Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Attainment level range (percent)         200.00%        
Maximum [Member] | 2016 and 2017 PSU [Member] | Performance Awards [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Attainment level range (percent)         150.00%        
Forecast [Member] | Restricted stock and RSUs [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share based compensation expense | $       $ 4.5          
Forecast [Member] | PSU [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share based compensation expense | $       $ 9.6          
Allegheny Technologies $350 million 9.375% Senior Notes due 2019 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Debt instrument carrying amount | $             $ 350.0    
Debt instrument interest rate stated percentage             9.375%