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Pension Plans and Other Postretirement Benefits (Details 11) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | $ 2,329.8 |  | $ 2,220.0 |  | $ 2,232.7
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 362.5 |  | 544.2 |  |
Significant Observable Inputs (Level 2) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 1,312.0 |  | 1,335.6 |  |
Significant Unobservable Inputs (Level 3) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 655.3 |  | 340.2 |  | 293.8
Equity Securities: ATI common stock [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 105.3 |  | 89.7 |  |
Equity Securities: ATI common stock [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 105.3 |  | 89.7 |  |
Equity Securities: ATI common stock [Member] | Significant Observable Inputs (Level 2) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 |  | 0 |  |
Equity Securities: ATI common stock [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 |  | 0 |  |
Equity Securities: Other U.S. equities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Percentage of co-mingled funds comprised of large-cap investments | 90.00% |  | 90.00% |  |
Percentage of co-mingled funds comprised of small-cap investments | 10.00% |  | 10.00% |  |
Equity Securities: Other U.S. equities [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 746.0 | [1] | 601.1 | [1] |
Equity Securities: Other U.S. equities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 257.2 | [1] | 198.2 | [1] |
Equity Securities: Other U.S. equities [Member] | Significant Observable Inputs (Level 2) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 488.8 | [1] | 402.9 | [1] |
Equity Securities: Other U.S. equities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 | [1] | 0 | [1] |
Equity Securities: International equities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Percentage of co-mingled funds comprised of developed countries investments | 80.00% |  | 80.00% |  |
Percentage of co-mingled funds comprised of emerging market investments | 20.00% |  | 20.00% |  |
Equity Securities: International equities [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 311.0 | [2] | 264.2 | [2] |
Equity Securities: International equities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 | [2] | 27.0 | [2] |
Equity Securities: International equities [Member] | Significant Observable Inputs (Level 2) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 311.0 | [2] | 237.2 | [2] |
Equity Securities: International equities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 | [2] | 0 | [2] |
Fixed income and cash equivalents [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 508.0 | [3] | 911.3 | [4] |
Fixed income and cash equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 | [3] | 224.5 | [4] |
Fixed income and cash equivalents [Member] | Significant Observable Inputs (Level 2) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 507.2 | [3] | 685.4 | [4] |
Fixed income and cash equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0.8 | [3] | 1.4 | [4] | 1.9
Floating rate [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 294.5 | [3] |  |  |
Floating rate [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 | [3] |  |  |
Floating rate [Member] | Significant Observable Inputs (Level 2) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 | [3] |  |  |
Floating rate [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 294.5 | [3] | 0 |  |
Private equity [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 94.5 |  | 85.5 |  |
Private equity [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 |  | 0 |  |
Private equity [Member] | Significant Observable Inputs (Level 2) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 |  | 0 |  |
Private equity [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 94.5 |  | 85.5 |  | 82.4
Hedge funds [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 139.7 |  | 148.9 |  |
Hedge funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 |  | 0 |  |
Hedge funds [Member] | Significant Observable Inputs (Level 2) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 |  | 0 |  |
Hedge funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 139.7 |  | 148.9 |  | 121.9
Real estate and other [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 130.8 |  | 119.3 |  |
Real estate and other [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 0 |  | 4.8 |  |
Real estate and other [Member] | Significant Observable Inputs (Level 2) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | 5.0 |  | 10.1 |  |
Real estate and other [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan Fair Value Of Plan Assets | $ 125.8 |  | $ 104.4 |  | $ 87.6
[1] | Includes investments in comingled funds that invest in U.S. equity securities, comprised of approximately 90% large-cap U.S. companies and 10% small-cap U.S. companies.
[2] | Includes investments in comingled funds that invest in non-U.S. equity securities, comprised of approximately 80% developed countries and 20% emerging market economies.
[3] | Global debt securities include both fixed interest rate and floating interest rate instruments. These are comprised of actively managed investments which include U.S. government and U.S. government agency securities, foreign government securities, corporate bonds, mortgage-backed securities and other debt securities, and include both investment grade and non-investment grade debt, public and private debt, and secured and unsecured debt investments. To mitigate risk, investment managers have limitations regarding the amount of investment in particular securities and the credit quality of such investments.
[4] | Fixed income investments are comprised of actively managed investments which include U.S. government and U.S. government agency securities, corporate bonds, mortgage-backed securities and other fixed income securities. To mitigate risk, investment managers have limitations regarding the amount of investment in particular securities and the credit quality of such investments.

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- Definition Defined Benefit Plan, Investment, Co-mingled Funds, Percentage Comprised of Developed Countries Investments + References No definition available. + Details
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- Definition Defined Benefit Plan, Investment, Co-mingled Funds, Percentage Comprised of Emerging Market Investments + References No definition available. + Details
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- Definition Defined Benefit Plan, Investment, Co-mingled Funds, Percentage Comprised of Large-cap Investments + References No definition available. + Details
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- Definition Defined Benefit Plan, Investment, Co-mingled Funds, Percentage Comprised of Small-cap Investments + References No definition available. + 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 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 2: 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 3: 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=21915506&loc=d3e1928-114920 Reference 4: 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 5: 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. + Details
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