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Summary of Significant Accounting Policies - Cost in Excess of Net Assets Acquired (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Goodwill	$ 727,900,000	$ 740,100,000
Foreign currency translation adjustment effect on goodwill	600,000
Goodwill impairment loss	0	0	0
High Performance Metals [Member]
Goodwill [Line Items]
Goodwill	601,400,000
Flat-Rolled Products [Member]
Goodwill [Line Items]
Goodwill	126,500,000
Tungsten Materials Business [Member]
Goodwill [Line Items]
Increase (decrease) in goodwill	(12,800,000)
Reporting Entity [Member] | High Performance Metals [Member]
Goodwill [Line Items]
Goodwill	$ 530,000,000
Percentage of fair value in excess of carrying amount	20.00%

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