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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Target Allocations [Abstract] |  |  |  |  |
Equity securities | 36.80% |  |  |  |
Debt securities | 37.30% |  |  |  |
Real estate | 8.00% |  |  |  |
Other, including cash and cash equivalents | 17.90% |  |  |  |
Target allocation | 1 |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Equity securities | 36.40% |  | 50.60% |  |
Debt securities | 37.80% |  | 23.60% |  |
Real estate | 5.80% |  | 5.90% |  |
Other, including cash and cash equivalents | 20.00% |  | 19.90% |  |
Actual allocation | 100.00% |  | 100.00% |  |
Defined benefit plan, fair value of plan assets | $ 259.3 |  | $ 247.1 |  | $ 255.2
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 101.1 |  | 97.0 |  |
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 93.5 |  | 89.2 |  |
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 64.7 |  | 60.9 |  | 59.3
Domestic stock funds [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 54.6 | [1] | 78.4 | [1] |
Domestic stock funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 25.0 | [1] | 47.0 | [1] |
Domestic stock funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 29.6 | [1] | 31.4 | [1] |
Domestic stock funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 | [1] | 0 | [1] |
International stock funds [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 39.6 | [1] | 46.4 | [1] |
International stock funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 12.1 | [1] | 23.2 | [1] |
International stock funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 27.5 | [1] | 23.2 | [1] |
International stock funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 | [1] | 0 | [1] |
Domestic bond funds [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 52.2 | [2] | 26.5 | [1] |
Domestic bond funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 52.2 | [1] | 26.5 | [1] |
Domestic bond funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 | [1] | 0 | [1] |
Domestic bond funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 | [1] | 0 | [1] |
International bond funds [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 34.0 | [2] | 31.6 | [2] |
International bond funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 | [1] |  | [1] |
International bond funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 34.0 | [1] | 31.6 | [1] |
International bond funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 | [1] | 0 | [1] |
Diversified real asset funds [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 11.8 | [2] |  |  |
Diversified real asset funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 11.8 | [2] |  |  |
Diversified real asset funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 | [2] |  |  |
Diversified real asset funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 | [2] |  |  |
Real Estate [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 15.2 | [3] | 14.5 | [3] |
Real Estate [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 | [3] | 0 | [3] |
Real Estate [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 | [3] | 0 | [3] |
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 15.2 | [3] | 14.5 | [3] | 13.9
Multi-strategy Funds [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 49.5 | [4] | 46.4 | [4] |
Multi-strategy Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 | [4] | 0 | [4] |
Multi-strategy Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 | [4] | 0 | [4] |
Multi-strategy Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 49.5 | [4] | 46.4 | [4] | 45.4
Cash and Cash Equivalents [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 2.4 |  | 3.3 |  |
Cash and Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 |  | 0.3 |  |
Cash and Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 2.4 |  | 3.0 |  |
Cash and Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Actual Allocation [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | $ 0 |  | $ 0 |  |
[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 Description of target allocation percentages, or range of percentages, considering the major categories of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that are pertinent to an understanding of the plan investment policies and strategies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -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 d(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 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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