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Employee Incentive Plans, Compensation expense under LTI programs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Mar. 31, 2016 | 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 |  | $ 3.0 | $ 2.4 | $ 5.6 | $ 4.6 |  |
Restricted Stock And Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  | 1.2 | 1.1 | 2.3 | 2.2 |  |
Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  | 0.0 | 0.3 | 0.3 | 0.7 |  |
TSR-Based Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  | 1.4 | 1.0 | 2.5 | 1.7 |  |
CP-Based Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  | 0.4 | 0.0 | 0.5 | 0.0 |  |
Fabricated Products |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  | 1.1 | 0.9 | 1.9 | 1.6 |  |
All Other |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  | $ 1.9 | $ 1.5 | $ 3.7 | $ 3.0 |  |
Minimum | TSR-Based Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of target number of underlying shares (percent) |  | 0.00% |  |  |  |  |
Minimum | CP-Based Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of target number of underlying shares (percent) |  | 0.00% |  |  |  |  |
Maximum | TSR-Based Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of target number of underlying shares (percent) |  | 200.00% |  |  |  |  |
Maximum | CP-Based Performance Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of target number of underlying shares (percent) |  | 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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