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Employee Benefits, Defined Benefit Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Additional Capital | Dec. 31, 2010 Additional Capital | Dec. 31, 2009 Additional Capital | Dec. 31, 2011 Common Stock Owned by Union VEBA Subject to Transfer Restriction | Dec. 31, 2010 Common Stock Owned by Union VEBA Subject to Transfer Restriction | Dec. 31, 2011 Canadian pension plan | Dec. 31, 2010 Canadian pension plan | Dec. 31, 2009 Canadian pension plan | Dec. 31, 2011 Canadian pension plan London, Ontario Facility | Dec. 31, 2011 VEBAs | Dec. 31, 2010 VEBAs | Dec. 31, 2009 VEBAs | Dec. 31, 2011 VEBAs Amortization of Prior Service Cost | Dec. 31, 2011 VEBAs Amortization of Net Actuarial Loss | Dec. 31, 2011 VEBAs Maximum | Mar. 31, 2011 VEBAs Additional Amount | Dec. 31, 2011 VEBAs Annual Cash Flows up to $20 Million | Dec. 31, 2011 VEBAs Annual Cash Flows in Excess of $20 Million | Dec. 31, 2011 Union VEBA trustrees | Dec. 31, 2010 Union VEBA | Dec. 31, 2009 Union VEBA | Dec. 31, 2011 Union VEBA Company Appointed trustrees | Dec. 31, 2011 Union VEBA USW Appointed trustrees | Dec. 31, 2011 Salaried VEBA | Dec. 31, 2010 Salaried VEBA | Dec. 31, 2009 Salaried VEBA
Defined Benefit Plan, Actual Plan Asset Allocations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of plan assets invested in equity securities |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of plan assets invested in debt securities |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Assets, Target Allocations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset mix target allocation in equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset mix target allocation in debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Postretirement Medical Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trustees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  | 2 | 2 |  |  |  |  |  |
Common stock, shares outstanding | 19,253,185 | 19,214,451 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,202,495 |  | 3,523,980 |  |  |  |  |  |  |  |  |  |  |
Postretirement medical plan common stock ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Unrestricted Union VEBA shares allowed to be sold in any twelve-month period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,321,485 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock transfer restriction annual period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock sold by Union VEBA | 1,321,485 | 1,321,485 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Union VEBA assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65.5 | [1] | $ 52.1 | [1] |  |  |  |  |  |  |  |  |  |
Reduction in Common stock owned by Union VEBA | (40.5) | (32.5) |  | (8.8) | (0.7) |  | (31.7) | [2] | (31.8) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Additional paid in capital | (40.5) | (32.5) |  | (8.8) | (0.7) |  | (31.7) | [2] | (31.8) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in Deferred tax assets |  |  |  | (25.0) | (19.6) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average price per share sold by Union VEBA | $ 49.58 | $ 39.39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reorganization value per share | $ 24.02 | $ 24.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Administrative expense obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Postretirement medical plan contribution obligation percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flow in determining VEBA obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued annual VEBA contribution | 0 | 2.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.8 |  |  |  |  |  |  |  | 0.3 |  |  |
Postretirement medical plan contribution obligation paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Administrative expenses of the VEBAs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3 |  | 0.3 |  |  |  |  |  |  |  |  |
Assumptions used to determine benefit obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  | 5.60% |  | 5.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.20% |  | 5.25% |  |  |  |  |  | 3.75% |  | 4.70% |  |  |
Rate of compensation increase |  |  |  |  |  |  |  |  |  |  | 3.00% |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial medical trend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.50% | [3] | 9.00% | [3] |  |  |  |  |  |  |  |  |  |
Ultimate medical trend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | [3],[4] | 5.00% | [4] | 5.00% | [4] |  |  |  |  |  |  |  |
Year that rate reaches ultimate trend rate | 2019 | 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2019 |  | 2019 |  | 2013 |  |  |  |  |  |  |  |  |
Effect of one-percentage-point increase in medical trend rate on accumulated postretirement benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.5 |  | 37.0 |  |  |  |  |  |  |  |  |  |  |
Effect of one-percentage-point decrease in medical trend rate on accumulated postretirement benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.8 |  | 30.4 |  |  |  |  |  |  |  |  |  |  |
Assumptions used to determine net periodic benefit cost (income) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  | 5.70% |  | 6.70% |  | 7.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.25% |  | 5.80% |  | 6.00% |  |  |  | 4.70% |  | 5.40% |  | 6.00% |
Expected long term return on plan assets |  |  |  |  |  |  |  |  |  |  | 5.40% | [5] | 5.40% | [5] | 6.00% | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% | [5] | 4.75% | [5] | 5.75% | [5] |  |  | 7.25% | [5] | 7.25% | [5] | 7.25% | [5]
Rate of compensation increase |  |  |  |  |  |  |  |  |  |  | 3.50% |  | 3.50% |  | 3.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial medical trend rate used in calculating net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% | [4] | 9.50% | [4] | 9.00% | [4] |  |  |  |  |  |  |  |
Ultimate medical trend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | [3],[4] | 5.00% | [4] | 5.00% | [4] |  |  |  |  |  |  |  |
Year that rate reaches ultimate trend rate | 2019 | 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2019 |  | 2019 |  | 2013 |  |  |  |  |  |  |  |  |
Effect of one-percentage-point increase on service and interest cost components |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.7 |  | 2.7 |  | 2.4 |  |  |  |  |  |  |  |  |
Effect of one-percentage-point decrease on service and interest cost components |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.1 |  | 2.2 |  | 1.9 |  |  |  |  |  |  |  |  |
Change in Benefit Obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligation at beginning of year |  |  |  |  |  |  |  |  |  |  | (5.4) |  | (4.1) |  |  |  |  | (348.6) |  | (344.8) |  |  |  |  |  |  |  |  |  | (289.0) |  |  |  |  |  |  |  | (59.6) |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  | (0.1) |  | 0.2 |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  |  |  |  | 0.2 |  | 0.1 |  | 0.1 |  |  | 2.2 |  | 2.0 |  | 2.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  |  |  |  |  |  |  |  |  |  | 0.3 |  | 0.3 |  | 0.2 |  |  | 17.4 |  | 19.1 |  | 18.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss (gain) |  |  |  |  |  |  |  |  |  |  | (0.2) | [6] | 0.8 | [6] |  |  |  | 96.8 | [6] | 2.8 | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan participant contributions |  |  |  |  |  |  |  |  |  |  | 0 |  | 0.1 |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefits paid by Company |  |  |  |  |  |  |  |  |  |  | (0.2) |  | (0.2) |  |  |  |  | (21.1) |  | (23.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefits paid by VEBA |  |  |  |  |  |  |  |  |  |  | (0.2) |  | (0.2) |  |  |  |  | (21.1) |  | (23.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement from Retiree Drug Subsidy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.0 | [7] | 3.1 | [7] |  |  |  |  |  |  |  |  |  |
Obligation at end of year |  |  |  |  |  |  |  |  |  |  | (5.4) |  | (5.4) |  | (4.1) |  |  | (446.9) |  | (348.6) |  | (344.8) |  |  |  |  |  |  |  | (370.0) |  | (289.0) |  |  |  |  |  | (76.9) |  | (59.6) |  |  |
Change in Plan Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FMV of plan assets at beginning of year |  |  |  |  |  |  |  |  |  |  | 4.9 |  | 4.1 |  |  |  |  | 506.6 |  | 422.4 |  |  |  |  |  |  |  |  |  | 445.7 |  |  |  |  |  |  |  | 60.9 |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  | (0.1) |  | 0.2 |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual return on assets |  |  |  |  |  |  |  |  |  |  | (0.2) |  | 0.3 |  |  |  |  | 16.9 |  | 49.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan participant contributions |  |  |  |  |  |  |  |  |  |  | 0 |  | 0.1 |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer/Company contributions |  |  |  |  |  |  |  |  |  |  | 0.5 |  | 0.4 |  |  |  |  | 0.1 |  | 2.3 |  |  |  |  |  | 20.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefits paid by Company |  |  |  |  |  |  |  |  |  |  | (0.2) |  | (0.2) |  |  |  |  | (21.1) |  | (23.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefits paid by VEBA |  |  |  |  |  |  |  |  |  |  | (0.2) |  | (0.2) |  |  |  |  | (21.1) |  | (23.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement from Retiree Drug Subsidy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.0 | [7] | 3.1 | [7] |  |  |  |  |  |  |  |  |  |
FMV of plan assets at end of year |  |  |  |  |  |  |  |  |  |  | 4.9 |  | 4.9 |  | 4.1 |  |  | 571.0 |  | 506.6 |  | 422.4 |  |  |  |  |  |  |  | 514.7 |  | 445.7 |  |  |  |  |  | 56.3 |  | 60.9 |  |  |
Benefit Obligations and Funded Status Additional Disclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss resulting from an increase in benefit cost for plan participants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss resulting from a decrease in discount rates used to determine benefit obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss resulting from change in actuarial assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prescription drug benefit retiree drug subsidy percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset In respect of VEBAs | 144.7 | 158.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net liability in respect of VEBA | 20.6 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Funded Status |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
APBO |  |  |  |  |  |  |  |  |  |  | (5.4) |  | (5.4) |  | (4.1) |  |  | (446.9) |  | (348.6) |  | (344.8) |  |  |  |  |  |  |  | (370.0) |  | (289.0) |  |  |  |  |  | (76.9) |  | (59.6) |  |  |
Plan assets |  |  |  |  |  |  |  |  |  |  | 4.9 |  | 4.9 |  | 4.1 |  |  | 571.0 |  | 506.6 |  | 422.4 |  |  |  |  |  |  |  | 514.7 |  | 445.7 |  |  |  |  |  | 56.3 |  | 60.9 |  |  |
Net Funded Status |  |  |  |  |  |  |  |  |  |  | (0.5) |  | (0.5) |  |  |  |  | 124.1 | [8] | 158.0 | [8] |  |  |  |  |  |  |  |  | 144.7 |  | 156.7 |  |  |  |  |  | (20.6) |  | 1.3 |  |  |
Projected benefit obligation |  |  |  |  |  |  |  |  |  |  | 4.9 |  | 4.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net benefits expected to be paid in 2012 |  |  |  |  |  |  |  |  |  |  | 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anticipated Retiree Drug Subsidy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anticipated Retiree Drug Subsidy, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3.1) |  |  |  |  |  |  |  |  |  |  |  |  |
Anticipated Retiree Drug Subsidy, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3.3) |  |  |  |  |  |  |  |  |  |  |  |  |
Anticipated Retiree Drug Subsidy, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3.5) |  |  |  |  |  |  |  |  |  |  |  |  |
Anticipated Retiree Drug Subsidy, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3.6) |  |  |  |  |  |  |  |  |  |  |  |  |
Anticipated Retiree Drug Subsidy, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3.7) |  |  |  |  |  |  |  |  |  |  |  |  |
Anticipated Retiree Drug Subsidy, 2017-2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (19.7) |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future benefit payments, 2012 | 25.8 |  |  |  |  |  |  |  |  |  | 0.2 |  |  |  |  |  |  | 28.7 | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future benefit payments, 2013 | 26.3 |  |  |  |  |  |  |  |  |  | 0.3 |  |  |  |  |  |  | 29.3 | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future benefit payments, 2014 | 26.4 |  |  |  |  |  |  |  |  |  | 0.3 |  |  |  |  |  |  | 29.6 | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future benefit payments, 2015 | 26.6 |  |  |  |  |  |  |  |  |  | 0.3 |  |  |  |  |  |  | 29.9 | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future benefit payments, 2016 | 26.7 |  |  |  |  |  |  |  |  |  | 0.3 |  |  |  |  |  |  | 30.1 | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future benefit payments, 2017-2021 | 159.4 |  |  |  |  |  |  |  |  |  | 1.8 |  |  |  |  |  |  | 177.3 | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated net actuarial (losses) gains |  |  |  |  |  |  |  |  |  |  | (2.0) |  | (1.8) |  |  |  |  | (95.1) |  | 14.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transition assets |  |  |  |  |  |  |  |  |  |  | 0.4 |  | 0.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (41.1) |  | (45.3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income recognized in Accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  | (1.6) |  | (1.4) |  |  |  |  | (136.2) |  | (30.6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts in Accumulated other comprehensive (loss) income expected to be recognized in 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts in Accumulated other comprehensive (loss) income expected to be recognized in 2012 |  |  |  |  |  |  |  |  |  |  | 0.1 |  |  |  |  |  |  | 7.2 |  |  |  |  |  | 4.2 | 3.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of Net Periodic Benefit Costs (Income) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  |  |  |  | 0.2 |  | 0.1 |  | 0.1 |  |  | 2.2 |  | 2.0 |  | 2.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  |  |  |  |  |  |  |  |  |  | 0.3 |  | 0.3 |  | 0.2 |  |  | 17.4 |  | 19.1 |  | 18.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected return on plan assets |  |  |  |  |  |  |  |  |  |  | (0.3) |  | (0.2) |  | (0.2) |  |  | (30.4) |  | (20.9) |  | (21.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost |  |  |  |  |  |  |  |  |  |  | 0 | [10] | 0 | [10] | 0 | [10] |  | 4.2 | [10] | 4.2 | [10] | 1.6 | [10] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net gain (loss) |  |  |  |  |  |  |  |  |  |  | 0.1 |  | 0 |  | 0 |  |  | 0.6 |  | 0.7 |  | 3.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs (income) | $ (5.7) | $ 5.1 | $ 5.3 |  |  |  |  |  |  |  | $ 0.3 |  | $ 0.2 |  | $ 0.1 |  |  | $ (6.0) |  | $ 5.1 |  | $ 5.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | At a weighted-average price of $49.58 and $39.39 per share realized by the Union VEBA for the years 2011 and 2010, respectively.
[2] | At $24.02 per share reorganization value.
[3] | The medical trend rate assumptions used for the Union VEBA were provided by the Union VEBA and certain industry data were provided by the Company's actuaries. The trend rate is assumed to decline to 5% by 2019 at December 31, 2011 and December 31, 2010. A one-percentage-point increase in the assumed medical trend rates would increase the accumulated postretirement benefit obligation of the Union VEBA by $50.5 and $37.0 at December 31, 2011 and December 31, 2010, respectively. A one-percentage-point decrease in the assumed medical trend rates would decrease the accumulated postretirement benefit obligation of the Union VEBA by $40.8 and $30.4 at December 31, 2011 and December 31, 2010, respectively.
[4] | The medical trend rate assumptions were used for the Union VEBA, which is currently paying certain prescription drug benefits, and provided by the Union VEBA and industry data from the Company's actuaries. The trend rate is assumed to decline to 5% by 2019, 5% by 2019 and 5% by 2013 for 2011, 2010 and 2009, respectively. A one-percentage-point increase in the assumed medical trend rates would increase the aggregate of the service and interest cost components of net periodic benefit costs by $2.7, $2.7 and $2.4 for 2011, 2010 and 2009, respectively. A one-percentage-point decrease in the assumed medical trend rates would decrease the aggregate of the service and interest cost components of net periodic benefit costs by $2.1, $2.2, and $1.9 for 2011, 2010 and 2009, respectively.
[5] | The expected long-term rate of return assumption is based on the historical investment portfolios provided to the Company by the VEBAs’ trustees.
[6] | The actuarial loss relating to the VEBA plans in 2011 is comprised of (i) a loss of $31.4 resulting from an increase in benefit cost for plan participants, (ii) a loss of $53.5 resulting from a decrease in discount rates used to determine benefit obligations for both VEBA plans and (iii) a loss of $11.9 resulting from change in actuarial assumptions. The actuarial loss relating to the VEBA plans in 2010 is primarily the result of a change in the assumption in participant marital status in the Union VEBA and a change in annual benefit payment per participant in the Salaried VEBA.
[7] | In January 2005, the Department of Health and Human Services’ Centers for Medicare and Medicaid Services (CMS) released final regulations governing the Medicare prescription drug benefit and other key elements of the Medicare Modernization Act that went into effect January 1, 2006. The Union VEBA is eligible for the Retiree Drug Subsidy because the plan meets the definition of actuarial equivalence and therefore qualifies for federal subsidies equal to 28% of allowable drug costs. As a result, the Company has measured the Union VEBA’s obligations and costs to take into account this subsidy.
[8] | With respect to the Prepaid benefit of $124.1 relating to the VEBAs at December 31, 2011, of which $144.7 was included in Net asset in respect of VEBA and $20.6 was included in Net liability in respect of VEBA on the Consolidated Balance Sheet. Prepaid benefit of $158.0 relating to the VEBAs at December 31, 2010, was included in Net asset in respect of the VEBAs on the Consolidated Balance Sheets.
[9] | Such amounts were obtained from the VEBAs. The Company's only financial obligations to the VEBAs are to pay the variable contributions which may not exceed $20.0 annually and certain administrative fees.
[10] | The Company amortizes prior service cost on a straight-line basis over the average remaining years of service to full eligibility for benefits of the active plan participants.

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- Definition Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=6521920 -Topic 715 -SubTopic 60 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=6521884 -Topic 715 -SubTopic 30 + Details
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- Definition Of the original amount of transition assets as of the date FAS 87 or 106 was initially applied, (a) the fair value of plan assets plus any recognized accrued pension or other postretirement benefit cost or less any recognized prepaid pension or other postretirement benefit cost in excess of (b) the benefit obligation, the portion of which has yet to be recognized as components of net periodic benefit cost. Of the original amount of transition obligations as of the date FAS 87 or 106 was initially applied, (a) the benefit obligation in excess of (b) the fair value of plan assets plus any recognized accrued pension or other postretirement benefit cost or less any recognized prepaid pension or other postretirement benefit cost, the portion of which has yet to be recognized as components of net periodic benefit cost. This amount is pretax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph ii -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i)-(j) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Transition Asset -URI http://asc.fasb.org/extlink&oid=6749452 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Transition Obligation -URI http://asc.fasb.org/extlink&oid=6749492 + Details
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- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6504226 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost) -URI http://asc.fasb.org/extlink&oid=6504192 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Amount of the period's gross receipts received from the prescription drug subsidy, which is to be used in the roll forward of the accumulated postretirement benefit obligation of an applicable postretirement benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS106-2 -Paragraph 20, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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