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Business Segments (Details8) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]            
Inventory valuation reserves   $ 121,500,000   $ 88,500,000 $ 121,500,000  
Segment Operating Profit Loss       413,200,000 283,400,000 $ 5,700,000
LIFO and net realizable value reserves       (700,000) (200,000) 800,000
Corporate expenses       (58,100,000) (50,500,000) (43,400,000)
Closed operations and other expenses       (21,600,000) (34,000,000) (34,600,000)
Restructuring and other charges       0 0 (538,500,000)
Impairment of goodwill     $ (114,400,000) 0 (114,400,000) 0
Debt extinguishment charge   $ (37,000,000)   0 (37,000,000) 0
Gain on joint venture deconsolidation $ 15,900,000     15,900,000 0 0
Interest expense, net       (101,000,000) (133,800,000) (124,000,000)
Income (loss) before income taxes       247,700,000 (86,500,000) (734,000,000)
High Performance Materials & Components            
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]            
Impairment of goodwill       0 (114,400,000) 0
Operating Segments | High Performance Materials & Components            
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]            
Segment Operating Profit Loss       335,400,000 246,400,000 168,700,000
Operating Segments | Flat Rolled Products            
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]            
Segment Operating Profit Loss       $ 77,800,000 $ 37,000,000 $ (163,000,000)