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Business Segments (Details8) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]            
Inventory valuation reserves $ 121,500,000     $ 121,500,000 $ 169,000,000  
Segment Operating Profit Loss       283,400,000 5,700,000 $ (84,800,000)
LIFO and net realizable value reserves       (200,000) 800,000 100,000
Corporate expenses       (50,500,000) (43,400,000) (44,700,000)
Closed operations and other expenses       (34,000,000) (34,600,000) (22,100,000)
Restructuring and other charges       0 (538,500,000) (89,700,000)
Impairment of goodwill   $ (114,400,000)   (114,400,000) 0 (126,600,000)
Debt extinguishment charge (37,000,000)     (37,000,000) 0 0
Interest expense, net       (133,800,000) (124,000,000) (110,200,000)
Loss before income taxes       (86,500,000) (734,000,000) (478,000,000)
High Performance Materials & Components [Member]            
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]            
Impairment of goodwill $ 0     (114,400,000) 0  
Flat Rolled Products [Member]            
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]            
Impairment of goodwill     $ (126,600,000)      
Operating Segments [Member] | High Performance Materials & Components [Member]            
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]            
Segment Operating Profit Loss       246,400,000 168,700,000 157,100,000
Operating Segments [Member] | Flat Rolled Products [Member]            
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]            
Segment Operating Profit Loss       $ 37,000,000 $ (163,000,000) $ (241,900,000)