Employee Incentive Plans, Short Term Incentive Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fabricated Products
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 0.1	$ 0.2	$ 0.3
All Other
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Deferred Compensation Arrangement with Individual, Compensation Expense	0.3	0.7	0.9
Short Term Incentive Plans [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Deferred Compensation Arrangement with Individual, Compensation Expense	14.0	12.7	15.7
Short Term Incentive Plans [Member] | Fabricated Products
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Deferred Compensation Arrangement with Individual, Compensation Expense	10.2	9.6	11.2
Short Term Incentive Plans [Member] | All Other
Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Deferred Compensation Arrangement with Individual, Compensation Expense	3.8	3.1	4.5
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	4.7	4.7	4.6
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	$ 9.3	$ 8.0	$ 11.1