Summary of Significant Accounting Policies, Textuals (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Fabricated Products	Dec. 31, 2013 Fabricated Products
Significant accounting policies [Line Items]
Charge relating to decrement of a prior year, higher cost LIFO layer	$ 1.8
Excess of current cost over the stated LIFO value of inventory		$ 11.1	$ 0.4