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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, 2017
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
$ / shares
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 | $       $ 397.8 $ 0.0 $ 0.0  
Granted (shares)       378,000 682,000 669,000  
Common stock shares available for future awards       5,600,000      
Shares vested       640,000 154,000 23,000  
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)     1,320,000 1,852,000 1,652,000 1,376,000  
Granted (shares)       378,000 682,000 669,000  
Vested (shares)       (640,000) (154,000) (23,000)  
Forfeited (shares)       (270,000) (328,000) (370,000)  
Nonvested end of the year (shares)       1,320,000 1,852,000 1,652,000 1,376,000
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     $ 32,500,000 $ 51,500,000 $ 57,000,000 $ 47,800,000  
Granted (in dollars per share) | $ / shares       7,100,000 8,400,000 20,800,000  
Vested (in dollars per share) | $ / shares       (18,400,000) (4,300,000) (800,000)  
Forfeited (in dollars per share) | $ / shares       (7,700,000) (9,600,000) (10,800,000)  
Ending balance (in dollars per share) | $ / shares       $ 32,500,000 $ 51,500,000 $ 57,000,000 $ 47,800,000
Retained Earnings Note Disclosure [Abstract]              
Undistributed earnings of investees accounted for under equity method | $       $ 10.0      
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Income target attainment measurement period       3 years      
Share based compensation expense | $           $ 5.5  
Restricted stock and RSUs [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share based compensation expense | $       $ 9.8 $ 11.2    
Unrecognized compensation expense | $       $ 7.3      
Performance Awards [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (shares)       590,000 937,000    
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)     1,441,000 919,000 0    
Granted (shares)       590,000 937,000    
Forfeited (shares)       (68,000) (18,000)    
Nonvested end of the year (shares)       1,441,000 919,000 0  
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     $ 22.7 $ 11.3 $ 0.0    
Granted (in dollars per share) | $ / shares       12.4 11.5    
Forfeited (in dollars per share) | $ / shares       (1.0) (0.2)    
Ending balance (in dollars per share) | $ / shares       $ 22.7 $ 11.3 $ 0.0  
2016 LTIP [Member] | Restricted Share Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (shares)         587,661    
Shares vested   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)   (190,421)          
2017 RSU [Member] | Restricted Share Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (shares)       320,679      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Granted (shares)       320,679      
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       122,882      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Vested (shares)       (122,882)      
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, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
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 | $       $ 3.8 $ 1.9    
Common stock shares available for future awards       2,200,000      
Unrecognized compensation expense | $       $ 8.8      
TSR and TSRP Awards [Member] | Performance Awards [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance measurement period       3 years      
Share based compensation expense | $       $ 3.6 $ 6.6 $ 10.6  
2016 PSU [Member] | Performance Awards [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (shares)         936,558    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Granted (shares)         936,558    
2017 PSU [Member] | Performance Awards [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (shares)       589,612      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]              
Granted (shares)       589,612      
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      
Attainment level range (percent)       25.00%      
Minimum [Member] | TSR and TSRP Awards [Member] | Performance Awards [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award multiplier       0      
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 | $       $ 33.3      
Attainment level range (percent)       150.00%      
Maximum [Member] | TSR and TSRP Awards [Member] | Performance Awards [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award multiplier       2      
Forecast [Member] | Restricted stock and RSUs [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share based compensation expense | $     $ 4.6        
Forecast [Member] | PSU [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share based compensation expense | $     $ 4.9        
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 | $       $ 0.0 $ 350.0    
Debt instrument interest rate stated percentage         9.375%