Employee Incentive Plans, Short Term Incentive Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Deferred Compensation Arrangement with Individual, Compensation Expense	$ (0.4)	$ 0.0	$ 0.1	$ 0.6
Short Term Incentive Plans [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Deferred Compensation Arrangement with Individual, Compensation Expense	2.9	2.9	10.8	9.9
Short Term Incentive Plans [Member] | Fabricated Products
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Deferred Compensation Arrangement with Individual, Compensation Expense	2.2	2.2	7.7	7.6
Short Term Incentive Plans [Member] | All Other
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Deferred Compensation Arrangement with Individual, Compensation Expense	0.7	0.7	3.1	2.3
Short Term Incentive Plans [Member] | Cost of products sold, excluding depreciation and amortization and other items
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Deferred Compensation Arrangement with Individual, Compensation Expense	1.0	1.3	3.2	3.8
Short Term Incentive Plans [Member] | SG&A and R&D
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 1.9	$ 1.6	$ 7.6	$ 6.1