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Joint Ventures (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 24 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]            
Sale to noncontrolling interest   $ 14.4 $ 3.7 $ 0.0    
Gain on joint venture deconsolidation $ 15.9 15.9 0.0 0.0    
Cash and cash equivalents   382.0 141.6 229.6   $ 149.8
Income (loss) from equity method investments   (1.0) 0.0 0.0    
Intercompany notes receivable   0.0 0.0      
Undistributed earnings of investees accounted for under equity method   $ 24.0        
Shanghai STAL Precision Stainless Steel Co Ltd [Member]            
Schedule of Equity Method Investments [Line Items]            
Joint venture ownership percentage   60.00%        
Cash and cash equivalents   $ 35.0        
Next Gen Alloys LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Joint venture ownership percentage   51.00%        
Sale to noncontrolling interest   $ 2.7        
Cash and cash equivalents   10.1        
Allegheny & Tsingshan Stainless [Member]            
Schedule of Equity Method Investments [Line Items]            
Sale to noncontrolling interest   $ 12.0        
Equity method investment ownership percentage   50.00%        
Revenue from related parties   $ 4.1        
Related party accounts receivable   0.6        
Intercompany notes receivable   $ 10.5        
Uniti [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity method investment ownership percentage   50.00%        
Revenue from related parties   $ 49.4 38.6 20.3    
Related party accounts receivable   $ 1.8 1.2      
China Baowu Steel Group Corporation Limited [Member] | Shanghai STAL Precision Stainless Steel Co Ltd [Member]            
Schedule of Equity Method Investments [Line Items]            
Joint venture ownership percentage by unaffiliated entity   40.00%        
Tsingshan Group [Member] | Allegheny & Tsingshan Stainless [Member]            
Schedule of Equity Method Investments [Line Items]            
Joint venture ownership percentage by unaffiliated entity   50.00%        
VSMPO [Member] | Uniti [Member]            
Schedule of Equity Method Investments [Line Items]            
Joint venture ownership percentage by unaffiliated entity   50.00%        
Flat Rolled Products | Allegheny & Tsingshan Stainless [Member]            
Schedule of Equity Method Investments [Line Items]            
Income (loss) from equity method investments   $ (3.9)        
Flat Rolled Products | Uniti [Member]            
Schedule of Equity Method Investments [Line Items]            
Income (loss) from equity method investments   $ 2.9 $ 0.6 $ 0.5    
Forecast [Member] | Allegheny & Tsingshan Stainless [Member]            
Schedule of Equity Method Investments [Line Items]            
Sale to noncontrolling interest         $ 17.5