Employee Incentive Plans, Short Term Incentive Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
EVA measurement period	1 year
Compensation charges associated with STI Plans
Costs recorded in connection with STI plans	$ 14.4	$ 8.4	$ 6.8
Fabricated Products
Compensation charges associated with STI Plans
Costs recorded in connection with STI plans	9.9	5.9	4.8
All Other
Compensation charges associated with STI Plans
Costs recorded in connection with STI plans	4.5	2.5	2.0
Cost of products sold, excluding depreciation and amortization and other items
Compensation charges associated with STI Plans
Costs recorded in connection with STI plans	4.3	3.2	2.9
Selling, administrative, research and development, and general
Compensation charges associated with STI Plans
Costs recorded in connection with STI plans	$ 10.1	$ 5.2	$ 3.9