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Business Segments (Details8) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Inventory valuation reserves $ 206.3 $ 169.0 $ 206.3  
Segment Operating Profit Loss   5.7 (84.8) $ 187.8
LIFO and net realizable value reserves   0.8 0.1 0.3
Corporate expenses   (43.4) (44.7) (49.6)
Closed operations and other expenses   (34.6) (22.1) (28.3)
Restructuring and other charges   (538.5) (89.7) 0.0
Impairment of goodwill   0.0 (126.6) 0.0
Interest expense, net   (124.0) (110.2) (108.7)
Income (loss) from continuing operations before income taxes   (734.0) (478.0) 1.5
High Performance Materials & Components [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Impairment of goodwill   0.0   0.0
Flat Rolled Products [Member]        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Impairment of goodwill $ (126.6)      
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   168.7 157.1 234.8
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   $ (163.0) $ (241.9) $ (47.0)