Employee Incentive Plans, Short Term Incentive Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Compensation charges associated with STI Plans
Costs recorded in connection with STI plans	$ 4.6	$ 4.6	$ 7.9	$ 7.0
Fabricated Products
Compensation charges associated with STI Plans
Costs recorded in connection with STI plans	3.1	3.5	5.5	5.4
All Other
Compensation charges associated with STI Plans
Costs recorded in connection with STI plans	1.5	1.1	2.4	1.6
Cost of products sold, excluding depreciation and amortization and other items
Compensation charges associated with STI Plans
Costs recorded in connection with STI plans	1.4	1.4	2.2	2.5
Selling, general, administrative, research and development
Compensation charges associated with STI Plans
Costs recorded in connection with STI plans	$ 3.2	$ 3.2	$ 5.7	$ 4.5