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Retirement Plans and Post Retirement Benefits Asset Allocation and Fair Value of Plan Assets (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Target Allocations [Abstract] |  |  |  |  |
Equity securities | 49.10% |  |  |  |
Debt securities | 24.60% |  |  |  |
Real estate | 8.10% |  |  |  |
Other, including cash and cash equivalents | 18.20% |  |  |  |
Target allocation | 1 |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Equity securities | 50.60% |  | 54.30% |  |
Debt securities | 23.60% |  | 21.40% |  |
Real estate | 5.90% |  | 5.40% |  |
Other, including cash and cash equivalents | 19.90% |  | 18.90% |  |
Actual allocation | 100.00% |  | 100.00% |  |
Fair value of plan assets | $ 247.1 |  | $ 255.2 |  | $ 232.7
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 97.0 |  | 106.9 |  |
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 89.2 |  | 89.0 |  |
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 60.9 |  | 59.3 |  | 54.8
Equity Investments [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 124.8 | [1] | 138.5 | [1] |
Equity Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 70.2 | [1] | 81.1 | [1] |
Equity Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 54.6 | [1] | 57.4 | [1] |
Fixed Income Investments [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 58.1 | [2] | 54.6 | [2] |
Fixed Income Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 26.5 | [2] | 25.8 | [2] |
Fixed Income Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 31.6 | [2] | 28.8 | [2] |
Real Estate [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 14.5 | [3] | 13.9 | [3] |
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 14.5 | [3] | 13.9 | [3] | 12.3
Multi-strategy Funds [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 46.4 | [4] | 45.4 | [4] |
Multi-strategy Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 46.4 | [4] | 45.4 | [4] | 42.5
Cash & Cash Equivalents [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 3.3 |  | 2.8 |  |
Cash & Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | 0.3 |  |  |  |
Cash & Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Fair value of plan assets | $ 3.0 |  | $ 2.8 |  |
[1] | Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.
[2] | Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.
[3] | Real estate investments are primarily invested in U.S. commercial real estate.
[4] | The multi-strategy funds invest in various hedge funds of fund strategies.

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- Definition The percentage of the fair value of debt securities to the fair value of total plan assets held as of the measurement date. + 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(1) -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 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The percentage of the fair value of investments other than debt securities, equity securities, and real estate to the fair value of total plan assets held as of the measurement date. + 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(1) -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 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The aggregate percentage of the fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of total plan assets held as of the measurement date. + 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(1) -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 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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