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Financial Information for Subsidiary and Guarantor Parent - Narrative (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]        
Cash and cash equivalents $ 1,026,800,000 $ 304,600,000 $ 380,600,000 $ 432,300,000
Current assets 2,950,800,000 2,510,600,000    
Assets 6,898,500,000 6,247,800,000 6,046,900,000  
Current liabilities 1,211,000,000 871,500,000    
Liabilities 3,903,800,000 3,660,700,000    
Stockholders' equity 2,994,700,000 2,587,100,000 2,571,600,000 2,129,400,000
Cash flows provided by (used in) operating activities 368,400,000 427,500,000 296,800,000  
Cash flows provided by (used in) investing activities (11,000,000) (378,700,000) (624,700,000)  
Cash flows provided by (used in) financing activities 364,800,000 (124,800,000) 276,200,000  
Guarantor Parent [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Cash and cash equivalents 3,600,000 5,500,000    
Current assets 30,100,000 7,000,000    
Assets 6,239,500,000 5,678,300,000    
Current liabilities 1,286,700,000 1,167,000,000    
Liabilities 3,244,800,000 3,091,200,000    
Stockholders' equity 2,994,700,000 2,587,100,000    
Cash flows provided by (used in) operating activities (41,100,000) (52,300,000) 58,900,000  
Cash flows provided by (used in) investing activities (8,100,000) (1,700,000) (385,100,000)  
Cash flows provided by (used in) financing activities 47,300,000 58,800,000 325,100,000  
Subsidiary [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Cash and cash equivalents 13,500,000 13,100,000    
Current assets 494,900,000 524,500,000    
Assets 2,074,200,000 1,588,000,000    
Current liabilities 1,131,000,000 541,400,000    
Liabilities 1,686,900,000 1,116,100,000    
Stockholders' equity 387,300,000 471,900,000    
Cash flows provided by (used in) operating activities (50,400,000) 43,900,000 58,300,000  
Cash flows provided by (used in) investing activities (564,600,000) (308,300,000) (77,200,000)  
Cash flows provided by (used in) financing activities 615,400,000 147,800,000 (10,500,000)  
Non-Guarantor Subsidiaries [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Cash and cash equivalents 1,009,700,000 286,000,000    
Current assets 4,015,200,000 3,269,000,000    
Assets 6,582,700,000 6,050,600,000    
Current liabilities 382,700,000 453,000,000    
Liabilities 761,500,000 943,400,000    
Stockholders' equity 5,821,200,000 5,107,200,000    
Cash flows provided by (used in) operating activities 484,200,000 435,900,000 190,400,000  
Cash flows provided by (used in) investing activities 312,900,000 (373,100,000) (66,500,000)  
Cash flows provided by (used in) financing activities (73,400,000) (27,000,000) (145,100,000)  
Eliminations [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Cash and cash equivalents 0 0    
Current assets (1,589,400,000) (1,289,900,000)    
Assets (7,997,900,000) (7,069,100,000)    
Current liabilities (1,589,400,000) (1,289,900,000)    
Liabilities (1,789,400,000) (1,490,000,000)    
Stockholders' equity (6,208,500,000) (5,579,100,000)    
Cash flows provided by (used in) operating activities (24,300,000) 0 (10,800,000)  
Cash flows provided by (used in) investing activities 248,800,000 304,400,000 (95,900,000)  
Cash flows provided by (used in) financing activities (224,500,000) (304,400,000) 106,700,000  
Restatement Adjustment [Member] | Guarantor Parent [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Cash flows provided by (used in) operating activities   (200,000) 75,100,000  
Cash flows provided by (used in) financing activities   200,000 (75,100,000)  
Restatement Adjustment [Member] | Subsidiary [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Assets   (141,100,000)    
Current liabilities   (141,100,000)    
Liabilities   (141,100,000)    
Cash flows provided by (used in) operating activities   (13,800,000) (19,900,000)  
Cash flows provided by (used in) investing activities     83,600,000  
Cash flows provided by (used in) financing activities   13,800,000 (63,700,000)  
Restatement Adjustment [Member] | Non-Guarantor Subsidiaries [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Current assets   1,289,900,000    
Assets   1,112,700,000    
Current liabilities   (196,800,000)    
Liabilities   (196,800,000)    
Stockholders' equity   1,309,500,000    
Cash flows provided by (used in) operating activities   13,200,000 (44,400,000)  
Cash flows provided by (used in) investing activities   (304,400,000) 7,800,000  
Cash flows provided by (used in) financing activities   291,200,000 36,600,000  
Restatement Adjustment [Member] | Eliminations [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Cash flows provided by (used in) operating activities   800,000 (10,800,000)  
Cash flows provided by (used in) investing activities   304,400,000 (91,400,000)  
Cash flows provided by (used in) financing activities   (305,200,000) 102,200,000  
Allegheny Ludlum 6.95% Debentures due 2025 [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Debt instrument carrying amount $ 150,000,000 $ 150,000,000    
Debt instrument interest rate stated percentage 6.95% 6.95%