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Summary of Significant Accounting Policies, Textuals, Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Property, Plant and Equipment
Interest expense capitalized as construction in progress	$ 0.4	$ 0.6
Depreciation expense	6.6	5.9
Fabricated Products
Property, Plant and Equipment
Depreciation expense	$ 6.5	$ 5.8

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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