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Fair Value Measurements, Fair Value Hierarchy Table (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Financial Assets: |  |  |  |
Investment Percentage in Industrial Sector | 53.00% |  | 53.00% |
Investment Percentage in Financial Sector | 38.00% |  | 36.00% |
Investment Percentage in Utilities Sector | 9.00% |  | 11.00% |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Financial Assets: |  |  |  |
Cash and cash equivalents | 49.8 |  | 135.6 |
Available for sale securities | 4.9 |  | 4.6 |
Total Assets | 677.3 |  | 728.8 |
Financial Liabilities: |  |  |  |
Notes | (203.0) |  | (214.7) |
Total Liabilities | (278.2) |  | (306.1) |
Fair Value, Measurements, Recurring [Member] | VEBAs and Canadian Pension Plan | Fixed income investment funds in registered investment companies |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 413.3 | [1] | 299.1 | [1]
Fair Value, Measurements, Recurring [Member] | VEBAs and Canadian Pension Plan | Mortgage backed securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 33.9 |  | 81.7 |
Fair Value, Measurements, Recurring [Member] | VEBAs and Canadian Pension Plan | Corporate debt securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 39.1 | [2] | 47.6 | [2]
Fair Value, Measurements, Recurring [Member] | VEBAs and Canadian Pension Plan | Equity investment funds in registered investment companies |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 52.3 | [3] | 32.8 | [3]
Fair Value, Measurements, Recurring [Member] | VEBAs and Canadian Pension Plan | United States Treasuries |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 1.6 |  | 15.0 |
Fair Value, Measurements, Recurring [Member] | VEBAs and Canadian Pension Plan | Municipal debt securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 6.3 |  | 7.1 |
Fair Value, Measurements, Recurring [Member] | VEBAs and Canadian Pension Plan | Cash and money market investments |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 12.1 | [4] | 11.2 | [4]
Fair Value, Measurements, Recurring [Member] | VEBAs and Canadian Pension Plan | Asset backed securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 5.0 |  | 10.1 |
Fair Value, Measurements, Recurring [Member] | VEBAs and Canadian Pension Plan | Diversified investment funds in registered investment companies |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 12.3 | [5] | 4.9 | [5]
Fair Value, Measurements, Recurring [Member] | Aluminum | Call option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 9.3 |
Fair Value, Measurements, Recurring [Member] | Aluminum | Put option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0.1 |
Fair Value, Measurements, Recurring [Member] | Aluminum | Fixed priced purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets | 0.3 |  | 18.2 |
Financial Liabilities: |  |  |  |
Derivative Liabilities | (7.8) |  | (0.4) |
Fair Value, Measurements, Recurring [Member] | Aluminum | Fixed priced sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities |  |  | (3.4) |
Fair Value, Measurements, Recurring [Member] | Aluminum | Midwest premium swap contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets | 0.1 |  | 0.2 |
Financial Liabilities: |  |  |  |
Derivative Liabilities | (0.1) |  | (0.1) |
Fair Value, Measurements, Recurring [Member] | Aluminum | Call option sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities |  |  | (9.3) |
Fair Value, Measurements, Recurring [Member] | Aluminum | Put option sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities |  |  | (0.1) |
Fair Value, Measurements, Recurring [Member] | Natural Gas | Call option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0.3 |
Fair Value, Measurements, Recurring [Member] | Natural Gas | Put option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 2.5 |
Fair Value, Measurements, Recurring [Member] | Natural Gas | Fixed priced purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0.1 |
Financial Liabilities: |  |  |  |
Derivative Liabilities | (1.3) |  | (0.5) |
Fair Value, Measurements, Recurring [Member] | Natural Gas | Put option sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities | (5.6) |  | (4.6) |
Fair Value, Measurements, Recurring [Member] | Electricity | Fixed priced purchase contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities | (1.8) |  |  |
Fair Value, Measurements, Recurring [Member] | Hedges Relating to the Notes | Call Options |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets | 46.3 |  | 48.4 |
Fair Value, Measurements, Recurring [Member] | Hedges Relating to the Notes | Bifurcated Conversion Feature |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities | (53.9) |  | (60.0) |
Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |  |
Financial Assets: |  |  |  |
Cash and cash equivalents | 49.8 |  | 135.6 |
Available for sale securities | 0 |  | 0 |
Total Assets | 61.9 |  | 146.8 |
Financial Liabilities: |  |  |  |
Notes | (203.0) |  | (214.7) |
Total Liabilities | (203.0) |  | (214.7) |
Fair Value, Measurements, Recurring [Member] | Level 1 | VEBAs and Canadian Pension Plan | Fixed income investment funds in registered investment companies |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | VEBAs and Canadian Pension Plan | Mortgage backed securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | VEBAs and Canadian Pension Plan | Corporate debt securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | VEBAs and Canadian Pension Plan | Equity investment funds in registered investment companies |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | VEBAs and Canadian Pension Plan | United States Treasuries |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | VEBAs and Canadian Pension Plan | Municipal debt securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | VEBAs and Canadian Pension Plan | Cash and money market investments |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 12.1 | [4] | 11.2 | [4]
Fair Value, Measurements, Recurring [Member] | Level 1 | VEBAs and Canadian Pension Plan | Asset backed securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | VEBAs and Canadian Pension Plan | Diversified investment funds in registered investment companies |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Aluminum | Call option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Aluminum | Put option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Aluminum | Fixed priced purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets | 0 |  | 0 |
Financial Liabilities: |  |  |  |
Derivative Liabilities | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Aluminum | Fixed priced sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Aluminum | Midwest premium swap contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets | 0 |  | 0 |
Financial Liabilities: |  |  |  |
Derivative Liabilities | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Aluminum | Call option sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Aluminum | Put option sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Natural Gas | Call option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Natural Gas | Put option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Natural Gas | Fixed priced purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0 |
Financial Liabilities: |  |  |  |
Derivative Liabilities | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Natural Gas | Put option sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Electricity | Fixed priced purchase contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 1 | Hedges Relating to the Notes | Call Options |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 | Hedges Relating to the Notes | Bifurcated Conversion Feature |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |  |
Financial Assets: |  |  |  |
Cash and cash equivalents | 0 |  | 0 |
Available for sale securities | 4.9 |  | 4.6 |
Total Assets | 615.3 |  | 581.8 |
Financial Liabilities: |  |  |  |
Notes | 0 |  | 0 |
Total Liabilities | (75.1) |  | (91.3) |
Fair Value, Measurements, Recurring [Member] | Level 2 | VEBAs and Canadian Pension Plan | Fixed income investment funds in registered investment companies |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 413.3 | [1] | 299.1 | [1]
Fair Value, Measurements, Recurring [Member] | Level 2 | VEBAs and Canadian Pension Plan | Mortgage backed securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 33.9 |  | 81.7 |
Fair Value, Measurements, Recurring [Member] | Level 2 | VEBAs and Canadian Pension Plan | Corporate debt securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 39.1 | [2] | 47.6 | [2]
Fair Value, Measurements, Recurring [Member] | Level 2 | VEBAs and Canadian Pension Plan | Equity investment funds in registered investment companies |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 52.3 | [3] | 32.8 | [3]
Fair Value, Measurements, Recurring [Member] | Level 2 | VEBAs and Canadian Pension Plan | United States Treasuries |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 1.6 |  | 15.0 |
Fair Value, Measurements, Recurring [Member] | Level 2 | VEBAs and Canadian Pension Plan | Municipal debt securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 6.3 |  | 7.1 |
Fair Value, Measurements, Recurring [Member] | Level 2 | VEBAs and Canadian Pension Plan | Cash and money market investments |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 2 | VEBAs and Canadian Pension Plan | Asset backed securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 5.0 |  | 10.1 |
Fair Value, Measurements, Recurring [Member] | Level 2 | VEBAs and Canadian Pension Plan | Diversified investment funds in registered investment companies |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 12.3 | [5] | 4.9 | [5]
Fair Value, Measurements, Recurring [Member] | Level 2 | Aluminum | Call option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 9.3 |
Fair Value, Measurements, Recurring [Member] | Level 2 | Aluminum | Put option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0.1 |
Fair Value, Measurements, Recurring [Member] | Level 2 | Aluminum | Fixed priced purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets | 0.3 |  | 18.2 |
Financial Liabilities: |  |  |  |
Derivative Liabilities | (7.8) |  | (0.4) |
Fair Value, Measurements, Recurring [Member] | Level 2 | Aluminum | Fixed priced sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities |  |  | (3.4) |
Fair Value, Measurements, Recurring [Member] | Level 2 | Aluminum | Midwest premium swap contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets | 0 |  | 0 |
Financial Liabilities: |  |  |  |
Derivative Liabilities | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 2 | Aluminum | Call option sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities |  |  | (9.3) |
Fair Value, Measurements, Recurring [Member] | Level 2 | Aluminum | Put option sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities |  |  | (0.1) |
Fair Value, Measurements, Recurring [Member] | Level 2 | Natural Gas | Call option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0.3 |
Fair Value, Measurements, Recurring [Member] | Level 2 | Natural Gas | Put option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 2.5 |
Fair Value, Measurements, Recurring [Member] | Level 2 | Natural Gas | Fixed priced purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0.1 |
Financial Liabilities: |  |  |  |
Derivative Liabilities | (1.3) |  | (0.5) |
Fair Value, Measurements, Recurring [Member] | Level 2 | Natural Gas | Put option sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities | (5.6) |  | (4.6) |
Fair Value, Measurements, Recurring [Member] | Level 2 | Electricity | Fixed priced purchase contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities | (1.8) |  |  |
Fair Value, Measurements, Recurring [Member] | Level 2 | Hedges Relating to the Notes | Call Options |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets | 46.3 |  | 48.4 |
Fair Value, Measurements, Recurring [Member] | Level 2 | Hedges Relating to the Notes | Bifurcated Conversion Feature |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities | (53.9) |  | (60.0) |
Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |  |
Financial Assets: |  |  |  |
Cash and cash equivalents | 0 |  | 0 |
Available for sale securities | 0 |  | 0 |
Total Assets | 0.1 |  | 0.2 |
Financial Liabilities: |  |  |  |
Notes | 0 |  | 0 |
Total Liabilities | (0.1) |  | (0.1) |
Fair Value, Measurements, Recurring [Member] | Level 3 | VEBAs and Canadian Pension Plan | Fixed income investment funds in registered investment companies |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | VEBAs and Canadian Pension Plan | Mortgage backed securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | VEBAs and Canadian Pension Plan | Corporate debt securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | VEBAs and Canadian Pension Plan | Equity investment funds in registered investment companies |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | VEBAs and Canadian Pension Plan | United States Treasuries |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | VEBAs and Canadian Pension Plan | Municipal debt securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | VEBAs and Canadian Pension Plan | Cash and money market investments |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | VEBAs and Canadian Pension Plan | Asset backed securities |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | VEBAs and Canadian Pension Plan | Diversified investment funds in registered investment companies |  |  |  |
Financial Assets: |  |  |  |
VEBAs and Canadian Pension Plan Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | Aluminum | Call option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | Aluminum | Put option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | Aluminum | Fixed priced purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets | 0 |  | 0 |
Financial Liabilities: |  |  |  |
Derivative Liabilities | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | Aluminum | Fixed priced sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | Aluminum | Midwest premium swap contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets | 0.1 |  | 0.2 |
Financial Liabilities: |  |  |  |
Derivative Liabilities | (0.1) |  | (0.1) |
Fair Value, Measurements, Recurring [Member] | Level 3 | Aluminum | Call option sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | Aluminum | Put option sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | Natural Gas | Call option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | Natural Gas | Put option purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | Natural Gas | Fixed priced purchase contracts |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets |  |  | 0 |
Financial Liabilities: |  |  |  |
Derivative Liabilities | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | Natural Gas | Put option sales contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | Electricity | Fixed priced purchase contracts |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Level 3 | Hedges Relating to the Notes | Call Options |  |  |  |
Financial Assets: |  |  |  |
Derivative Assets | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 | Hedges Relating to the Notes | Bifurcated Conversion Feature |  |  |  |
Financial Liabilities: |  |  |  |
Derivative Liabilities | 0 |  | 0 |
Los Angeles Promissory Note | Fair Value, Measurements, Recurring [Member] |  |  |  |
Financial Liabilities: |  |  |  |
Promissory Note |  |  | (7.0) |
Los Angeles Promissory Note | Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |  |
Financial Liabilities: |  |  |  |
Promissory Note |  |  | 0 |
Los Angeles Promissory Note | Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |  |
Financial Liabilities: |  |  |  |
Promissory Note |  |  | (7.0) |
Los Angeles Promissory Note | Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |  |
Financial Liabilities: |  |  |  |
Promissory Note |  |  | 0 |
Nichols Promissory Note | Fair Value, Measurements, Recurring [Member] |  |  |  |
Financial Liabilities: |  |  |  |
Promissory Note | (4.7) |  | (6.0) |
Nichols Promissory Note | Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |  |
Financial Liabilities: |  |  |  |
Promissory Note | 0 |  | 0 |
Nichols Promissory Note | Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |  |
Financial Liabilities: |  |  |  |
Promissory Note | (4.7) |  | (6.0) |
Nichols Promissory Note | Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |  |
Financial Liabilities: |  |  |  |
Promissory Note | 0 |  | 0 |
[1] | This category represents investments in various fixed income funds with multiple registered investment companies. Such funds invest in diversified portfolios, including (a) marketable fixed income securities such as (i) U.S. Treasury and other government issued debt securities, (ii) mortgage backed securities, (iii) asset backed securities, (iv) corporate bonds, notes and debentures in various sectors, (v) preferred stock, (vi) various deposit accounts and (vii) repurchase agreements and reverse repurchase agreements, (b) higher yielding, non-investment-grade fixed income securities in the high yield market, (c) debt securities of issuers located in countries with new or emerging markets, denominated in U.S. dollars or other foreign currencies and (d) fixed income instruments which may be represented by options, future contracts or swap agreements. The fair value of assets in this category is estimated using the net asset value per share of the investments.
[2] | This category represents investments in fixed income corporate securities in various sectors. Investments in the industrial, financial and utilities sectors in 2011 represented approximately 53%, 38% and 9% of the total portfolio in this category, respectively. Investments in the industrial, financial and utilities sectors in 2010 represented approximately 53%, 36% and 11% of the total portfolio in this category, respectively. The fair value of assets in this category is estimated using the net asset value per share of the investments.
[3] | This category represents investments in equity funds that invest in portfolios comprised of (i) equity securities of U.S. companies with a certain market capitalization threshold, (ii) American Depositary Receipts, or ADRs, for securities of non-U.S. issuers, and (iii) securities whose principal market is outside of U.S. The fair value of assets in this category is estimated using the net asset value per share of the investments. The fair value of assets in this category is estimated using the net asset value per share of the investments.
[4] | This category represents cash and investments in various money market funds.
[5] | The plan assets are invested in investment funds that hold a diversified portfolio of U.S and international equity securities and fixed income securities such as corporate bonds, government bonds, mortgage and asset backed securities. The fair value of assets in this category is estimated using the net asset value per share of the investments.

X
- Definition Investment Percentage in Financial Sector + References No definition available. + Details
Name: | kalu_InvestmentPercentageInFinancialSector
Namespace Prefix: | kalu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Investment Percentage in Industrial Sector + References No definition available. + Details
Name: | kalu_InvestmentPercentageInIndustrialSector
Namespace Prefix: | kalu_
Data Type: | num:percentItemType
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: 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. 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 Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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