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Business Segments (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Number of business segments | segment	2
Segment Reporting Information [Line Items]
Sales	$ 869.1	$ 770.5	$ 2,615.2	$ 2,338.5
Operating profit (loss):	54.4	26.2	195.2	(47.3)
LIFO and net realizable value reserves	(0.1)	0.0	(0.2)	0.4
Corporate expenses	(14.8)	(9.8)	(36.9)	(32.6)
Closed operations and other expenses	(12.2)	(15.4)	(28.4)	(24.6)
Impairment of goodwill	(114.4)	0.0	(114.4)	0.0
Restructuring and other charges	0.0	(499.9)	0.0	(509.9)
Interest expense, net	(34.2)	(32.6)	(102.2)	(91.2)
Income (loss) before income tax provision (benefit)	(121.3)	(531.5)	(86.9)	(705.2)
High Performance Materials & Components
Segment Reporting Information [Line Items]
Operating profit (loss):	61.7	47.0	180.6	114.9
Impairment of goodwill			(114.4)
Flat Rolled Products
Segment Reporting Information [Line Items]
Operating profit (loss):	(7.3)	(20.8)	14.6	(162.2)
Operating Segments
Segment Reporting Information [Line Items]
Sales	898.6	796.4	2,711.8	2,420.9
Operating Segments | High Performance Materials & Components
Segment Reporting Information [Line Items]
Sales	526.3	474.7	1,593.3	1,493.7
Operating Segments | Flat Rolled Products
Segment Reporting Information [Line Items]
Sales	372.3	321.7	1,118.5	927.2
Internal Customers | Operating Segments
Segment Reporting Information [Line Items]
Sales	29.5	25.9	96.6	82.4
Internal Customers | Operating Segments | High Performance Materials & Components
Segment Reporting Information [Line Items]
Sales	13.4	12.9	43.6	40.5
Internal Customers | Operating Segments | Flat Rolled Products
Segment Reporting Information [Line Items]
Sales	16.1	13.0	53.0	41.9
External Customers | Operating Segments
Segment Reporting Information [Line Items]
Sales	869.1	770.5	2,615.2	2,338.5
External Customers | Operating Segments | High Performance Materials & Components
Segment Reporting Information [Line Items]
Sales	512.9	461.8	1,549.7	1,453.2
External Customers | Operating Segments | Flat Rolled Products
Segment Reporting Information [Line Items]
Sales	$ 356.2	$ 308.7	$ 1,065.5	$ 885.3

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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