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Employee Incentive Plans Employee Incentive Plans, Compensation expense under LTI programs (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cumulative-effect adjustment | [1] |  |  | $ 0.7
Allocated Share-based Compensation Expense |  | $ 2.6 | $ 2.1 |
Restricted Stock And Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense |  | 1.1 | 1.1 |
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense |  | 0.3 | 0.4 |
Market-based shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense |  | 1.1 | 0.6 |
Cost Performance-Based Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense |  | 0.1 | 0.0 |
Fabricated Products |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense |  | 0.8 | 0.7 |
All Other |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense |  | $ 1.8 | $ 1.4 |
Minimum | Market-based shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 0.00% |  |
Minimum | Cost Performance-Based Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 0.00% |  |
Maximum | Market-based shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 200.00% |  |
Maximum | Cost Performance-Based Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 200.00% |  |
Additional Paid in Capital |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cumulative-effect adjustment | [1] |  |  | 0.8
Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cumulative-effect adjustment | [1] |  |  | 0.7
Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect | Additional Paid in Capital |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cumulative-effect adjustment | [1] |  |  | $ 0.8
[1] | See Note 4 and Note 6 for discussion of our adoption of ASU 2016-09 (as defined in Note 1).

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