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Employee Benefits, Defined Benefit Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 Additional Paid in Capital | Sep. 30, 2011 Additional Paid in Capital | Sep. 30, 2012 Common Stock Owned by Union VEBA | Sep. 30, 2011 Common Stock Owned by Union VEBA | Sep. 30, 2012 VEBAs | Sep. 30, 2012 VEBAs Maximum | Sep. 30, 2012 Union VEBA trustrees | Sep. 30, 2011 Union VEBA | Sep. 30, 2012 Union VEBA Company Appointed trustrees | Sep. 30, 2012 Union VEBA USW Appointed trustrees | Sep. 30, 2012 Salaried VEBA | Sep. 30, 2012 Salaried employees Defined benefit plan London, Ontario Facility Equity Securities | Dec. 31, 2011 Salaried employees Defined benefit plan London, Ontario Facility Equity Securities | Sep. 30, 2012 Salaried employees Defined benefit plan London, Ontario Facility Debt Securities | Dec. 31, 2011 Salaried employees Defined benefit plan London, Ontario Facility Debt Securities | Dec. 31, 2011 Variable cash contribution VEBAs | Sep. 30, 2012 Variable cash contribution VEBAs Maximum | Sep. 30, 2012 Variable cash contribution VEBAs Annual Cash Flows up to $20 Million | Sep. 30, 2012 Variable cash contribution VEBAs Annual Cash Flows in Excess of $20 Million
Defined Benefit Plan at the London, Ontario Facility, Information About Plan Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual plan asset allocations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  | 40.00% |  |  |  |
Asset mix target allocation on long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  | 43.00% |  |  |  |  |
Postretirement Medical Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trustees |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |
Administrative expenses of the VEBAs obligation |  |  |  |  |  |  |  |  |  | $ 0.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Postretirement medical plan contribution obligation percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 20.00%
Cash flow in determining VEBA obligation |  |  |  |  |  |  |  |  | 20.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable cash contribution obligation to VEBAs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.0 |  |
Liquidity requirement |  |  |  |  |  |  |  |  | 50.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent allocation of total contribution between VEBAs |  |  |  |  |  |  |  |  |  |  | 85.50% |  |  |  |  |  | 14.50% |  |  |  |  |  |  |  |
Accrued annual VEBA contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Common stock held by Union VEBA which ceased to be subject to transfer restrictions |  |  |  |  |  |  |  |  |  |  | 2,202,495 |  | 1,321,485 |  |  |  |  |  |  |  |  |  |  |  |
Increase in Union VEBA assets |  |  |  |  |  |  |  |  |  |  | 108.6 | [1] | 65.5 | [1] |  |  |  |  |  |  |  |  |  |  |
Reduction in Common stock owned by Union VEBA | (67.0) |  | (14.1) | (9.1) | (52.9) | [2] | (31.7) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Additional paid in capital | (67.0) |  | (14.1) | (9.1) | (52.9) | [2] | (31.7) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in Deferred tax assets |  |  | $ (41.6) | $ (24.7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average price per share sold by Union VEBA |  |  |  |  |  |  |  |  |  |  | $ 49.31 |  | $ 49.58 |  |  |  |  |  |  |  |  |  |  |  |
Reorganization value per share | $ 24.02 | $ 24.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | At a weighted-average price of $49.31 per share for the nine months ended September 30, 2012 and a weighted-average price of $49.58 per share realized by the Union VEBA for the nine months ended September 30, 2011.
[2] | At $24.02 per share reorganization value.

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